diff --git a/Reconstruction/PFA/Pandora/GaudiPandora/CMakeLists.txt b/Reconstruction/PFA/Pandora/GaudiPandora/CMakeLists.txt
index 82163d59885262cbc8ca009f70e9eca9ad811e48..01a0267f1890ca67df4831a5067719b65e73d88c 100644
--- a/Reconstruction/PFA/Pandora/GaudiPandora/CMakeLists.txt
+++ b/Reconstruction/PFA/Pandora/GaudiPandora/CMakeLists.txt
@@ -30,6 +30,7 @@ target_include_directories(GaudiPandora PUBLIC
   ${GEAR_INCLUDE_DIRS}
   ${PandoraSDK_INCLUDE_DIRS}
   ${LCContent_INCLUDE_DIRS}
+  ${LCIO_INCLUDE_DIRS}
 )
 
 install(TARGETS GaudiPandora
diff --git a/Reconstruction/PFA/Pandora/GaudiPandora/include/CaloHitCreator.h b/Reconstruction/PFA/Pandora/GaudiPandora/include/CaloHitCreator.h
index df9793abc42eca3ebf7c83ae6a968077ec65ee3a..7be4f3eda09de92d827794c49f94d740a838b41d 100644
--- a/Reconstruction/PFA/Pandora/GaudiPandora/include/CaloHitCreator.h
+++ b/Reconstruction/PFA/Pandora/GaudiPandora/include/CaloHitCreator.h
@@ -25,7 +25,7 @@
 
 #include <string>
 
-typedef std::vector<edm4hep::CalorimeterHit *> CalorimeterHitVector;
+typedef std::vector<edm4hep::ConstCalorimeterHit *> CalorimeterHitVector;
 
 namespace gear { class GearMgr; }
 
@@ -174,25 +174,25 @@ private:
      *  @brief  Get common calo hit properties: position, parent address, input energy and time
      * 
      */
-    void GetCommonCaloHitProperties(const edm4hep::CalorimeterHit *const pCaloHit, PandoraApi::CaloHit::Parameters &caloHitParameters) const;
+    void GetCommonCaloHitProperties(edm4hep::ConstCalorimeterHit *const pCaloHit, PandoraApi::CaloHit::Parameters &caloHitParameters) const;
 
     /**
      *  @brief  Get end cap specific calo hit properties: cell size, absorber radiation and interaction lengths, normal vector
      * 
      */
-    void GetEndCapCaloHitProperties(const edm4hep::CalorimeterHit *const pCaloHit, const gear::LayerLayout &layerLayout,
+    void GetEndCapCaloHitProperties(edm4hep::ConstCalorimeterHit *const pCaloHit, const gear::LayerLayout &layerLayout,
         PandoraApi::CaloHit::Parameters &caloHitParameters, float &absorberCorrection) const;
-    void GetEndCapCaloHitProperties(const edm4hep::CalorimeterHit *const pCaloHit, const std::vector<dd4hep::rec::LayeredCalorimeterStruct::Layer> &layers,
+    void GetEndCapCaloHitProperties(edm4hep::ConstCalorimeterHit *const pCaloHit, const std::vector<dd4hep::rec::LayeredCalorimeterStruct::Layer> &layers,
     PandoraApi::CaloHit::Parameters &caloHitParameters, float &absorberCorrection) const;
 
     /**
      *  @brief  Get barrel specific calo hit properties: cell size, absorber radiation and interaction lengths, normal vector
      * 
      */
-    void GetBarrelCaloHitProperties(const edm4hep::CalorimeterHit *const pCaloHit, const gear::LayerLayout &layerLayout,
+    void GetBarrelCaloHitProperties(edm4hep::ConstCalorimeterHit *const pCaloHit, const gear::LayerLayout &layerLayout,
         unsigned int barrelSymmetryOrder, float barrelPhi0, unsigned int staveNumber, PandoraApi::CaloHit::Parameters &caloHitParameters,
         float &absorberCorrection) const;
-    void GetBarrelCaloHitProperties(const edm4hep::CalorimeterHit *const pCaloHit, const std::vector<dd4hep::rec::LayeredCalorimeterStruct::Layer> &layers,
+    void GetBarrelCaloHitProperties(edm4hep::ConstCalorimeterHit *const pCaloHit, const std::vector<dd4hep::rec::LayeredCalorimeterStruct::Layer> &layers,
         unsigned int barrelSymmetryOrder, float barrelPhi0, unsigned int staveNumber, PandoraApi::CaloHit::Parameters &caloHitParameters,
         float &absorberCorrection) const;
 
@@ -200,13 +200,13 @@ private:
      *  @brief  Get number of active layers from position of a calo hit to the edge of the detector
      * 
      */
-    int GetNLayersFromEdge(const edm4hep::CalorimeterHit *const pCaloHit) const;
+    int GetNLayersFromEdge(edm4hep::ConstCalorimeterHit *const pCaloHit) const;
 
     /**
      *  @brief  Get the maximum radius of a calo hit in a polygonal detector structure
      * 
      */
-    float GetMaximumRadius(const edm4hep::CalorimeterHit *const pCaloHit, const unsigned int symmetryOrder, const float phi0) const;
+    float GetMaximumRadius(edm4hep::ConstCalorimeterHit *const pCaloHit, const unsigned int symmetryOrder, const float phi0) const;
 
     /**
      *  @brief  Get the layer coding string from the provided cell id encoding string
diff --git a/Reconstruction/PFA/Pandora/GaudiPandora/include/MCParticleCreator.h b/Reconstruction/PFA/Pandora/GaudiPandora/include/MCParticleCreator.h
index 4e446cf9c59ed15ea3f28034f99adedd8f407917..90281ef238e4b9eaad4b94814e2e29f5e66d9deb 100644
--- a/Reconstruction/PFA/Pandora/GaudiPandora/include/MCParticleCreator.h
+++ b/Reconstruction/PFA/Pandora/GaudiPandora/include/MCParticleCreator.h
@@ -78,7 +78,7 @@ private:
     const Settings          m_settings;                         ///< The mc particle creator settings
     const pandora::Pandora *m_pPandora;                         ///< Address of the pandora object to create the mc particles
     const float             m_bField;                           ///< The bfield
-    std::map<unsigned int, const edm4hep::MCParticle*>*  m_id_pMC_map;
+    std::map<unsigned int, edm4hep::ConstMCParticle*>*  m_id_pMC_map;
 };
 
 inline void MCParticleCreator::Reset()
diff --git a/Reconstruction/PFA/Pandora/GaudiPandora/include/PandoraPFAlg.h b/Reconstruction/PFA/Pandora/GaudiPandora/include/PandoraPFAlg.h
index 6a7a1bacfe9a26b462c645215dcc63370707d35a..7f6b57d2aa0ff26dae5b450d5da1a976f264c217 100644
--- a/Reconstruction/PFA/Pandora/GaudiPandora/include/PandoraPFAlg.h
+++ b/Reconstruction/PFA/Pandora/GaudiPandora/include/PandoraPFAlg.h
@@ -54,12 +54,12 @@ class CollectionMaps
 public:
     CollectionMaps();
     void clear();
-    std::map<std::string, std::vector<edm4hep::MCParticle> >     collectionMap_MC;
-    std::map<std::string, std::vector<edm4hep::CalorimeterHit> > collectionMap_CaloHit;
-    std::map<std::string, std::vector<edm4hep::Vertex> >         collectionMap_Vertex;
-    std::map<std::string, std::vector<edm4hep::Track> >          collectionMap_Track;
-    std::map<std::string, std::vector<edm4hep::MCRecoCaloAssociation> > collectionMap_CaloRel;
-    std::map<std::string, std::vector<edm4hep::MCRecoTrackerAssociation> > collectionMap_TrkRel;
+    std::map<std::string, std::vector<edm4hep::ConstMCParticle> >     collectionMap_MC;
+    std::map<std::string, std::vector<edm4hep::ConstCalorimeterHit> > collectionMap_CaloHit;
+    std::map<std::string, std::vector<edm4hep::ConstVertex> >         collectionMap_Vertex;
+    std::map<std::string, std::vector<edm4hep::ConstTrack> >          collectionMap_Track;
+    std::map<std::string, std::vector<edm4hep::ConstMCRecoCaloAssociation> > collectionMap_CaloRel;
+    std::map<std::string, std::vector<edm4hep::ConstMCRecoTrackerAssociation> > collectionMap_TrkRel;
 };
 
 
diff --git a/Reconstruction/PFA/Pandora/GaudiPandora/include/TrackCreator.h b/Reconstruction/PFA/Pandora/GaudiPandora/include/TrackCreator.h
index ad8f903451f4cea1a2a9b2a1879a615fd01d4139..1094a3dd7803c140a008ba109855e2f2d4a3db37 100644
--- a/Reconstruction/PFA/Pandora/GaudiPandora/include/TrackCreator.h
+++ b/Reconstruction/PFA/Pandora/GaudiPandora/include/TrackCreator.h
@@ -24,7 +24,7 @@ namespace gear { class GearMgr; }
 
 class CollectionMaps;
 
-typedef std::vector<const edm4hep::Track *> TrackVector;
+typedef std::vector<edm4hep::ConstTrack *> TrackVector;
 typedef std::set<unsigned int> TrackList;
 typedef std::map<edm4hep::ConstTrack, int> TrackToPidMap;
 /*
@@ -125,7 +125,7 @@ public:
      */
     pandora::StatusCode CreateTrackAssociations(const CollectionMaps& collectionMaps);
 
-    const edm4hep::Track* GetTrackAddress(const CollectionMaps& collectionMaps, const edm4hep::ConstTrack& pTrack );
+    edm4hep::ConstTrack* GetTrackAddress(const CollectionMaps& collectionMaps, const edm4hep::ConstTrack& pTrack );
     /**
      *  @brief  Create tracks, insert user code here
      * 
@@ -198,7 +198,7 @@ private:
      *  @brief  Copy track states stored in tracks to pandora track parameters
      * 
      */
-    void GetTrackStates(const edm4hep::Track *const pTrack, PandoraApi::Track::Parameters &trackParameters) const;
+    void GetTrackStates(edm4hep::ConstTrack *const pTrack, PandoraApi::Track::Parameters &trackParameters) const;
 
     /**
      *  @brief  Copy track state from track state instance to pandora input track state
@@ -210,13 +210,13 @@ private:
      *  @brief  Obtain track time when it reaches ECAL
      * 
      */
-    float CalculateTrackTimeAtCalorimeter(const edm4hep::Track *const pTrack) const;
+    float CalculateTrackTimeAtCalorimeter(edm4hep::ConstTrack *const pTrack) const;
 
     /**
      *  @brief  Decide whether track reaches the ecal surface
      * 
      */
-    void TrackReachesECAL(const edm4hep::Track *const pTrack, PandoraApi::Track::Parameters &trackParameters) const;
+    void TrackReachesECAL(edm4hep::ConstTrack *const pTrack, PandoraApi::Track::Parameters &trackParameters) const;
 
     /**
      *  @brief  Determine whether a track can be used to form a pfo under the following conditions:
@@ -224,7 +224,7 @@ private:
      *          2) if the track proves to have no cluster associations
      * 
      */
-    void DefineTrackPfoUsage(const edm4hep::Track *const pTrack, PandoraApi::Track::Parameters &trackParameters) const;
+    void DefineTrackPfoUsage(edm4hep::ConstTrack *const pTrack, PandoraApi::Track::Parameters &trackParameters) const;
 
     /**
      *  @brief  Whether track passes the quality cuts required in order to be used to form a pfo
@@ -232,19 +232,19 @@ private:
      * 
      *  @return boolean
      */
-    bool PassesQualityCuts(const edm4hep::Track *const pTrack, const PandoraApi::Track::Parameters &trackParameters) const;
+    bool PassesQualityCuts(edm4hep::ConstTrack *const pTrack, const PandoraApi::Track::Parameters &trackParameters) const;
 
     /**
      *  @brief  Get number of hits in TPC of a track
      * 
      */
-    int GetNTpcHits(const edm4hep::Track *const pTrack) const;
+    int GetNTpcHits(edm4hep::ConstTrack *const pTrack) const;
 
     /**
      *  @brief  Get number of hits in FTD of a track
      * 
      */
-    int GetNFtdHits(const edm4hep::Track *const pTrack) const;
+    int GetNFtdHits(edm4hep::ConstTrack *const pTrack) const;
 
     const Settings          m_settings;                     ///< The track creator settings
     const pandora::Pandora *m_pPandora;                     ///< Address of the pandora object to create tracks and track relationships
diff --git a/Reconstruction/PFA/Pandora/GaudiPandora/src/CaloHitCreator.cpp b/Reconstruction/PFA/Pandora/GaudiPandora/src/CaloHitCreator.cpp
index e3bd6e3c3e9812a2fe75637c9ca3a0782c7b3933..ae958c84b875b7d50ed759182a22c6145e0b06ce 100644
--- a/Reconstruction/PFA/Pandora/GaudiPandora/src/CaloHitCreator.cpp
+++ b/Reconstruction/PFA/Pandora/GaudiPandora/src/CaloHitCreator.cpp
@@ -240,14 +240,15 @@ pandora::StatusCode CaloHitCreator::CreateECalCaloHits(const CollectionMaps& col
         try
         {
             if(m_settings.m_debug) std::cout<<"CaloHitCreator for "<<tmp_col_name<<std::endl;
-            const std::vector<edm4hep::CalorimeterHit>& pCaloHitCollection = (collectionMaps.collectionMap_CaloHit.find(tmp_col_name))->second;
+            auto pCaloHitCollection = (collectionMaps.collectionMap_CaloHit.find(tmp_col_name))->second;
             const int nElements(pCaloHitCollection.size());
 
             if (0 == nElements)
                 continue;
 
+            auto tmpCaloHit0 = pCaloHitCollection.at(0);
 
-            ID_UTIL::CellIDDecoder<const edm4hep::CalorimeterHit> cellIdDecoder(m_encoder_str);
+            ID_UTIL::CellIDDecoder<decltype(tmpCaloHit0)> cellIdDecoder(m_encoder_str);
             const std::string layerCodingString(m_encoder_str);
             const std::string layerCoding(this->GetLayerCoding(layerCodingString));
             const std::string staveCoding(this->GetStaveCoding(layerCodingString));
@@ -275,8 +276,8 @@ pandora::StatusCode CaloHitCreator::CreateECalCaloHits(const CollectionMaps& col
             {
                 try
                 {
-                    const edm4hep::CalorimeterHit& pCaloHit0 = pCaloHitCollection.at(i);
-                    const edm4hep::CalorimeterHit* pCaloHit = &(pCaloHit0);
+                    auto pCaloHit0 = pCaloHitCollection.at(i);
+                    auto pCaloHit = &(pCaloHit0);
 
                     if (NULL == pCaloHit)
                         throw ("CreateECalCaloHits pCaloHit Collection type mismatch");
@@ -363,7 +364,7 @@ pandora::StatusCode CaloHitCreator::CreateECalCaloHits(const CollectionMaps& col
                     }
 
                     PANDORA_THROW_RESULT_IF(pandora::STATUS_CODE_SUCCESS, !=, PandoraApi::CaloHit::Create(*m_pPandora, caloHitParameters));
-                    m_calorimeterHitVector.push_back(const_cast<edm4hep::CalorimeterHit*>(pCaloHit));
+                    m_calorimeterHitVector.push_back((pCaloHit));
                 }
                 catch (pandora::StatusCodeException &statusCodeException)
                 {
@@ -394,14 +395,15 @@ pandora::StatusCode CaloHitCreator::CreateHCalCaloHits(const CollectionMaps& col
         if(collectionMaps.collectionMap_CaloHit.find(tmp_col_name) == collectionMaps.collectionMap_CaloHit.end()) { if(m_settings.m_debug) std::cout<<"not find "<<tmp_col_name<<std::endl; continue;}
         try
         {
-            const std::vector<edm4hep::CalorimeterHit>& pCaloHitCollection = (collectionMaps.collectionMap_CaloHit.find(tmp_col_name))->second;
+            auto pCaloHitCollection = (collectionMaps.collectionMap_CaloHit.find(tmp_col_name))->second;
             const int nElements(pCaloHitCollection.size());
 
             if (0 == nElements)
                 continue;
 
+            auto tmpCaloHit0 = pCaloHitCollection.at(0);
 
-            ID_UTIL::CellIDDecoder<const edm4hep::CalorimeterHit> cellIdDecoder(m_encoder_str);
+            ID_UTIL::CellIDDecoder<decltype(tmpCaloHit0)> cellIdDecoder(m_encoder_str);
             const std::string layerCodingString(m_encoder_str);
             const std::string layerCoding(this->GetLayerCoding(layerCodingString));
             const std::string staveCoding(this->GetStaveCoding(layerCodingString));
@@ -429,8 +431,8 @@ pandora::StatusCode CaloHitCreator::CreateHCalCaloHits(const CollectionMaps& col
             {
                 try
                 {
-                    const edm4hep::CalorimeterHit& pCaloHit0 = pCaloHitCollection.at(i);
-                    const edm4hep::CalorimeterHit* pCaloHit = &(pCaloHit0);
+                    auto pCaloHit0 = pCaloHitCollection.at(i);
+                    auto pCaloHit = &(pCaloHit0);
 
                     if (NULL == pCaloHit)
                         throw ("CreateHCalCaloHits Collection type mismatch");
@@ -487,7 +489,7 @@ pandora::StatusCode CaloHitCreator::CreateHCalCaloHits(const CollectionMaps& col
                     caloHitParameters.m_electromagneticEnergy = m_settings.m_hCalToEMGeV * pCaloHit->getEnergy();
 
                     PANDORA_THROW_RESULT_IF(pandora::STATUS_CODE_SUCCESS, !=, PandoraApi::CaloHit::Create(*m_pPandora, caloHitParameters));
-                    m_calorimeterHitVector.push_back(const_cast<edm4hep::CalorimeterHit*>(pCaloHit));
+                    m_calorimeterHitVector.push_back((pCaloHit));
                 }
                 catch (pandora::StatusCodeException &statusCodeException)
                 {
@@ -518,14 +520,15 @@ pandora::StatusCode CaloHitCreator::CreateMuonCaloHits(const CollectionMaps& col
         if(collectionMaps.collectionMap_CaloHit.find(tmp_col_name) == collectionMaps.collectionMap_CaloHit.end()) {if(m_settings.m_debug) std::cout<<"not find "<<tmp_col_name<<std::endl; continue;}
         try
         {
-            const std::vector<edm4hep::CalorimeterHit>& pCaloHitCollection = (collectionMaps.collectionMap_CaloHit.find(tmp_col_name))->second;
+            auto pCaloHitCollection = (collectionMaps.collectionMap_CaloHit.find(tmp_col_name))->second;
             const int nElements(pCaloHitCollection.size());
 
             if (0 == nElements)
                 continue;
 
+            auto tmpCaloHit0 = pCaloHitCollection.at(0);
 
-            ID_UTIL::CellIDDecoder<const edm4hep::CalorimeterHit> cellIdDecoder(m_encoder_str_MUON);
+            ID_UTIL::CellIDDecoder<decltype(tmpCaloHit0)> cellIdDecoder(m_encoder_str_MUON);
             const std::string layerCodingString(m_encoder_str_MUON);
             const std::string layerCoding(this->GetLayerCoding(layerCodingString));
             const std::string staveCoding(this->GetStaveCoding(layerCodingString));
@@ -555,8 +558,8 @@ pandora::StatusCode CaloHitCreator::CreateMuonCaloHits(const CollectionMaps& col
             {
                 try
                 {
-                    const edm4hep::CalorimeterHit& pCaloHit0 = pCaloHitCollection.at(i);
-                    const edm4hep::CalorimeterHit* pCaloHit = &(pCaloHit0);
+                    auto pCaloHit0 = pCaloHitCollection.at(i);
+                    auto pCaloHit = &(pCaloHit0);
 
                     if (NULL == pCaloHit)
                         throw ("Muon Collection type mismatch");
@@ -627,7 +630,7 @@ pandora::StatusCode CaloHitCreator::CreateMuonCaloHits(const CollectionMaps& col
                     }
 
                     PANDORA_THROW_RESULT_IF(pandora::STATUS_CODE_SUCCESS, !=, PandoraApi::CaloHit::Create(*m_pPandora, caloHitParameters));
-                    m_calorimeterHitVector.push_back(const_cast<edm4hep::CalorimeterHit*>(pCaloHit));
+                    m_calorimeterHitVector.push_back((pCaloHit));
                 }
                 catch (pandora::StatusCodeException &statusCodeException)
                 {
@@ -658,15 +661,17 @@ pandora::StatusCode CaloHitCreator::CreateLCalCaloHits(const CollectionMaps& col
         if(collectionMaps.collectionMap_CaloHit.find(*iter) == collectionMaps.collectionMap_CaloHit.end()) {if(m_settings.m_debug)std::cout<<"not find "<<(*iter)<<std::endl; continue;}
         try
         {
-            const std::vector<edm4hep::CalorimeterHit>& pCaloHitCollection = (collectionMaps.collectionMap_CaloHit.find(*iter))->second;
+            auto pCaloHitCollection = (collectionMaps.collectionMap_CaloHit.find(*iter))->second;
             const int nElements(pCaloHitCollection.size());
 
             if (0 == nElements)
                 continue;
 
+            auto tmpCaloHit0 = pCaloHitCollection.at(0);
+
             const gear::LayerLayout &endcapLayerLayout(_GEAR->getLcalParameters().getLayerLayout()); 
 
-            ID_UTIL::CellIDDecoder<const edm4hep::CalorimeterHit> cellIdDecoder(m_encoder_str_LCal);
+            ID_UTIL::CellIDDecoder<decltype(tmpCaloHit0)> cellIdDecoder(m_encoder_str_LCal);
             const std::string layerCodingString(m_encoder_str_LCal);
             const std::string layerCoding(this->GetLayerCoding(layerCodingString));
 
@@ -674,8 +679,8 @@ pandora::StatusCode CaloHitCreator::CreateLCalCaloHits(const CollectionMaps& col
             {
                 try
                 {
-                    const edm4hep::CalorimeterHit& pCaloHit0 = pCaloHitCollection.at(i);
-                    const edm4hep::CalorimeterHit* pCaloHit = &(pCaloHit0);
+                    auto pCaloHit0 = pCaloHitCollection.at(i);
+                    auto pCaloHit = &(pCaloHit0);
 
                     if (NULL == pCaloHit)
                         throw ("LCal Collection type mismatch");
@@ -700,7 +705,7 @@ pandora::StatusCode CaloHitCreator::CreateLCalCaloHits(const CollectionMaps& col
                     caloHitParameters.m_hadronicEnergy = m_settings.m_eCalToHadGeVEndCap * pCaloHit->getEnergy();
 
                     PANDORA_THROW_RESULT_IF(pandora::STATUS_CODE_SUCCESS, !=, PandoraApi::CaloHit::Create(*m_pPandora, caloHitParameters));
-                    m_calorimeterHitVector.push_back(const_cast<edm4hep::CalorimeterHit*>(pCaloHit));
+                    m_calorimeterHitVector.push_back((pCaloHit));
                 }
                 catch (pandora::StatusCodeException &statusCodeException)
                 {
@@ -731,15 +736,16 @@ pandora::StatusCode CaloHitCreator::CreateLHCalCaloHits(const CollectionMaps& co
         if(collectionMaps.collectionMap_CaloHit.find(*iter) == collectionMaps.collectionMap_CaloHit.end()) {if(m_settings.m_debug) std::cout<<"not find "<<(*iter)<<std::endl; continue;}
         try
         {
-            const std::vector<edm4hep::CalorimeterHit>& pCaloHitCollection = (collectionMaps.collectionMap_CaloHit.find(*iter))->second;
+            auto pCaloHitCollection = (collectionMaps.collectionMap_CaloHit.find(*iter))->second;
             const int nElements(pCaloHitCollection.size());
 
             if (0 == nElements)
                 continue;
 
             const gear::LayerLayout &endcapLayerLayout(_GEAR->getLHcalParameters().getLayerLayout());
+            auto tmpCaloHit0 = pCaloHitCollection.at(0);
 
-            ID_UTIL::CellIDDecoder<const edm4hep::CalorimeterHit> cellIdDecoder(m_encoder_str_LHCal);
+            ID_UTIL::CellIDDecoder<decltype(tmpCaloHit0)> cellIdDecoder(m_encoder_str_LHCal);
             const std::string layerCodingString(m_encoder_str_LHCal);
             const std::string layerCoding(this->GetLayerCoding(layerCodingString));
 
@@ -747,8 +753,8 @@ pandora::StatusCode CaloHitCreator::CreateLHCalCaloHits(const CollectionMaps& co
             {
                 try
                 {
-                    const edm4hep::CalorimeterHit& pCaloHit0 = pCaloHitCollection.at(i);
-                    const edm4hep::CalorimeterHit* pCaloHit = &(pCaloHit0);
+                    auto pCaloHit0 = pCaloHitCollection.at(i);
+                    auto pCaloHit = &(pCaloHit0);
 
                     if (NULL == pCaloHit)
                         throw ("LHCal Collection type mismatch");
@@ -773,7 +779,7 @@ pandora::StatusCode CaloHitCreator::CreateLHCalCaloHits(const CollectionMaps& co
                     caloHitParameters.m_electromagneticEnergy = m_settings.m_hCalToEMGeV * pCaloHit->getEnergy();
 
                     PANDORA_THROW_RESULT_IF(pandora::STATUS_CODE_SUCCESS, !=, PandoraApi::CaloHit::Create(*m_pPandora, caloHitParameters));
-                    m_calorimeterHitVector.push_back(const_cast<edm4hep::CalorimeterHit*>(pCaloHit));
+                    m_calorimeterHitVector.push_back((pCaloHit));
                 }
                 catch (pandora::StatusCodeException &statusCodeException)
                 {
@@ -796,7 +802,7 @@ pandora::StatusCode CaloHitCreator::CreateLHCalCaloHits(const CollectionMaps& co
 
 //------------------------------------------------------------------------------------------------------------------------------------------
 
-void CaloHitCreator::GetCommonCaloHitProperties(const edm4hep::CalorimeterHit *const pCaloHit, PandoraApi::CaloHit::Parameters &caloHitParameters) const
+void CaloHitCreator::GetCommonCaloHitProperties(edm4hep::ConstCalorimeterHit *const pCaloHit, PandoraApi::CaloHit::Parameters &caloHitParameters) const
 {
     const float pCaloHitPosition[3]={pCaloHit->getPosition()[0], pCaloHit->getPosition()[1], pCaloHit->getPosition()[2]};
     const pandora::CartesianVector positionVector(pCaloHitPosition[0], pCaloHitPosition[1], pCaloHitPosition[2]);
@@ -811,7 +817,7 @@ void CaloHitCreator::GetCommonCaloHitProperties(const edm4hep::CalorimeterHit *c
 
 //------------------------------------------------------------------------------------------------------------------------------------------
 
-void CaloHitCreator::GetEndCapCaloHitProperties(const edm4hep::CalorimeterHit *const pCaloHit, const gear::LayerLayout &layerLayout,
+void CaloHitCreator::GetEndCapCaloHitProperties(edm4hep::ConstCalorimeterHit *const pCaloHit, const gear::LayerLayout &layerLayout,
     PandoraApi::CaloHit::Parameters &caloHitParameters, float &absorberCorrection) const
 {
     caloHitParameters.m_hitRegion = pandora::ENDCAP;
@@ -856,7 +862,7 @@ void CaloHitCreator::GetEndCapCaloHitProperties(const edm4hep::CalorimeterHit *c
 }
 
 //------------------------------------------------------------------------------------------------------------------------------------------
-void CaloHitCreator::GetEndCapCaloHitProperties(const edm4hep::CalorimeterHit *const pCaloHit, const std::vector<dd4hep::rec::LayeredCalorimeterStruct::Layer> &layers,
+void CaloHitCreator::GetEndCapCaloHitProperties(edm4hep::ConstCalorimeterHit *const pCaloHit, const std::vector<dd4hep::rec::LayeredCalorimeterStruct::Layer> &layers,
     PandoraApi::CaloHit::Parameters &caloHitParameters, float &absorberCorrection) const
 {
     caloHitParameters.m_hitRegion = pandora::ENDCAP;
@@ -908,7 +914,7 @@ void CaloHitCreator::GetEndCapCaloHitProperties(const edm4hep::CalorimeterHit *c
 }
 //------------------------------------------------------------------------------------------------------------------------------------------
 
-void CaloHitCreator::GetBarrelCaloHitProperties(const edm4hep::CalorimeterHit *const pCaloHit, const gear::LayerLayout &layerLayout,
+void CaloHitCreator::GetBarrelCaloHitProperties(edm4hep::ConstCalorimeterHit *const pCaloHit, const gear::LayerLayout &layerLayout,
     unsigned int barrelSymmetryOrder, float barrelPhi0, unsigned int staveNumber, PandoraApi::CaloHit::Parameters &caloHitParameters,
     float &absorberCorrection) const
 {
@@ -971,7 +977,7 @@ void CaloHitCreator::GetBarrelCaloHitProperties(const edm4hep::CalorimeterHit *c
     }
 }
 
-void CaloHitCreator::GetBarrelCaloHitProperties(const edm4hep::CalorimeterHit *const pCaloHit, const std::vector<dd4hep::rec::LayeredCalorimeterStruct::Layer> &layers,
+void CaloHitCreator::GetBarrelCaloHitProperties(edm4hep::ConstCalorimeterHit *const pCaloHit, const std::vector<dd4hep::rec::LayeredCalorimeterStruct::Layer> &layers,
     unsigned int barrelSymmetryOrder, float barrelPhi0, unsigned int staveNumber, PandoraApi::CaloHit::Parameters &caloHitParameters,
     float &absorberCorrection) const
 {
@@ -1048,7 +1054,7 @@ void CaloHitCreator::GetBarrelCaloHitProperties(const edm4hep::CalorimeterHit *c
 
 //------------------------------------------------------------------------------------------------------------------------------------------
 
-int CaloHitCreator::GetNLayersFromEdge(const edm4hep::CalorimeterHit *const pCaloHit) const
+int CaloHitCreator::GetNLayersFromEdge(edm4hep::ConstCalorimeterHit *const pCaloHit) const
 {
     // Calo hit coordinate calculations
     const float barrelMaximumRadius(this->GetMaximumRadius(pCaloHit, m_hCalBarrelOuterSymmetry, m_hCalBarrelOuterPhi0));
@@ -1090,7 +1096,7 @@ int CaloHitCreator::GetNLayersFromEdge(const edm4hep::CalorimeterHit *const pCal
 
 //------------------------------------------------------------------------------------------------------------------------------------------
 
-float CaloHitCreator::GetMaximumRadius(const edm4hep::CalorimeterHit *const pCaloHit, const unsigned int symmetryOrder, const float phi0) const
+float CaloHitCreator::GetMaximumRadius(edm4hep::ConstCalorimeterHit *const pCaloHit, const unsigned int symmetryOrder, const float phi0) const
 {
     
     const float pCaloHitPosition[3]={pCaloHit->getPosition()[0], pCaloHit->getPosition()[1], pCaloHit->getPosition()[2]};
diff --git a/Reconstruction/PFA/Pandora/GaudiPandora/src/MCParticleCreator.cpp b/Reconstruction/PFA/Pandora/GaudiPandora/src/MCParticleCreator.cpp
index a9042a82183231212b3362656c9d38ab8ef6bbf0..ce8b42d8519f51ec472103c402c41a0088b0e776 100644
--- a/Reconstruction/PFA/Pandora/GaudiPandora/src/MCParticleCreator.cpp
+++ b/Reconstruction/PFA/Pandora/GaudiPandora/src/MCParticleCreator.cpp
@@ -26,7 +26,7 @@ MCParticleCreator::MCParticleCreator(const Settings &settings, const pandora::Pa
     m_pPandora(pPandora),
     m_bField(settings.m_bField)
 {
-m_id_pMC_map = new std::map<unsigned int, const edm4hep::MCParticle*>;
+m_id_pMC_map = new std::map<unsigned int, edm4hep::ConstMCParticle*>;
 }
 
 //------------------------------------------------------------------------------------------------------------------------------------------
@@ -45,20 +45,20 @@ pandora::StatusCode MCParticleCreator::CreateMCParticles(const CollectionMaps& c
         if(collectionMaps.collectionMap_MC.find(*iter) == collectionMaps.collectionMap_MC.end()) continue;
         try
         {
-            const std::vector<edm4hep::MCParticle>& pMCParticleCollection = (collectionMaps.collectionMap_MC.find(*iter))->second;
+            auto pMCParticleCollection = (collectionMaps.collectionMap_MC.find(*iter))->second;
             std::cout<<"Do CreateMCParticles, collection:"<<(*iter)<<", size="<<pMCParticleCollection.size()<<std::endl;
             for (int im = 0; im < pMCParticleCollection.size(); im++)
             {
                 try
                 {
-                    const edm4hep::MCParticle& pMcParticle = pMCParticleCollection.at(im);
+                    auto pMcParticle = pMCParticleCollection.at(im);
                     PandoraApi::MCParticle::Parameters mcParticleParameters;
                     mcParticleParameters.m_energy =   sqrt(pMcParticle.getMomentum()[0] * pMcParticle.getMomentum()[0] + pMcParticle.getMomentum()[1] * pMcParticle.getMomentum()[1] + pMcParticle.getMomentum()[2] * pMcParticle.getMomentum()[2] + pMcParticle.getMass() * pMcParticle.getMass());
                     mcParticleParameters.m_particleId = pMcParticle.getPDG();
                     mcParticleParameters.m_mcParticleType = pandora::MC_3D;
                     mcParticleParameters.m_pParentAddress = &pMcParticle;
                     unsigned int p_id = pMcParticle.id();
-                    const edm4hep::MCParticle* p_mc = &pMcParticle;
+                    auto p_mc = &pMcParticle;
                     (*m_id_pMC_map) [p_id]   = p_mc;
                     mcParticleParameters.m_momentum = pandora::CartesianVector(pMcParticle.getMomentum()[0], pMcParticle.getMomentum()[1],
                         pMcParticle.getMomentum()[2]);
@@ -78,7 +78,7 @@ pandora::StatusCode MCParticleCreator::CreateMCParticles(const CollectionMaps& c
                            if(pMCParticleCollection.at(ida).id()==(*itDaughter).id())
                            {
                               
-                                const edm4hep::MCParticle& dMcParticle = pMCParticleCollection.at(ida);
+                                auto dMcParticle = pMCParticleCollection.at(ida);
                                 if(&pMcParticle == &dMcParticle){std::cout<< "error, mother and daughter are the same mc particle, don't save SetMCParentDaughterRelationship"<<std::endl;}
                                 else PANDORA_THROW_RESULT_IF(pandora::STATUS_CODE_SUCCESS, !=, PandoraApi::SetMCParentDaughterRelationship(*m_pPandora, &pMcParticle, &dMcParticle));
                                 break;
@@ -108,7 +108,7 @@ pandora::StatusCode MCParticleCreator::CreateMCParticles(const CollectionMaps& c
 
 pandora::StatusCode MCParticleCreator::CreateCaloHitToMCParticleRelationships(const CollectionMaps& collectionMaps, const CalorimeterHitVector &calorimeterHitVector) const
 {
-    typedef std::map<const edm4hep::MCParticle *, float> MCParticleToEnergyWeightMap;
+    typedef std::map<edm4hep::ConstMCParticle *, float> MCParticleToEnergyWeightMap;
     MCParticleToEnergyWeightMap mcParticleToEnergyWeightMap;
 
     for (StringVector::const_iterator iter = m_settings.m_CaloHitRelationCollections.begin(), iterEnd = m_settings.m_CaloHitRelationCollections.end();
@@ -117,7 +117,7 @@ pandora::StatusCode MCParticleCreator::CreateCaloHitToMCParticleRelationships(co
         if(collectionMaps.collectionMap_CaloRel.find(*iter) == collectionMaps.collectionMap_CaloRel.end()) continue;
         try
         {
-            const std::vector<edm4hep::MCRecoCaloAssociation>& pMCRecoCaloAssociationCollection = (collectionMaps.collectionMap_CaloRel.find(*iter))->second;
+            auto pMCRecoCaloAssociationCollection = (collectionMaps.collectionMap_CaloRel.find(*iter))->second;
 
             for (unsigned i_calo=0; i_calo < calorimeterHitVector.size(); i_calo++)
             {
@@ -128,14 +128,14 @@ pandora::StatusCode MCParticleCreator::CreateCaloHitToMCParticleRelationships(co
                     {
                         if( pMCRecoCaloAssociationCollection.at(ic).getRec().id() != (*(calorimeterHitVector.at(i_calo))).id() ) continue;
                         
-                        const edm4hep::ConstSimCalorimeterHit pSimHit = pMCRecoCaloAssociationCollection.at(ic).getSim();
+                        auto pSimHit = pMCRecoCaloAssociationCollection.at(ic).getSim();
                         for (int iCont = 0, iEnd = pSimHit.contributions_size(); iCont < iEnd; ++iCont)
                         {
-                            edm4hep::ConstCaloHitContribution conb = pSimHit.getContributions(iCont);
-                            const edm4hep::ConstMCParticle ipa = conb.getParticle();
+                            auto conb = pSimHit.getContributions(iCont);
+                            auto ipa = conb.getParticle();
                             float  ien = conb.getEnergy();
                             if( m_id_pMC_map->find(ipa.id()) == m_id_pMC_map->end() ) continue;
-                            const edm4hep::MCParticle * p_tmp = (*m_id_pMC_map)[ipa.id()]; 
+                            auto p_tmp = (*m_id_pMC_map)[ipa.id()]; 
                             mcParticleToEnergyWeightMap[p_tmp] += ien;
                         }
                         
@@ -172,32 +172,32 @@ pandora::StatusCode MCParticleCreator::CreateTrackToMCParticleRelationships(cons
 {
     for (unsigned ik = 0; ik < trackVector.size(); ik++)
     {
-        const edm4hep::Track *pTrack = trackVector.at(ik);
+        auto pTrack = trackVector.at(ik);
         // Get reconstructed momentum at dca
         const pandora::Helix helixFit(pTrack->getTrackStates(0).phi, pTrack->getTrackStates(0).D0, pTrack->getTrackStates(0).Z0, pTrack->getTrackStates(0).omega, pTrack->getTrackStates(0).tanLambda, m_bField);
         const float recoMomentum(helixFit.GetMomentum().GetMagnitude());
         // Use momentum magnitude to identify best mc particle
-        edm4hep::MCParticle *pBestMCParticle = NULL;
+        edm4hep::ConstMCParticle *pBestMCParticle = NULL;
         float bestDeltaMomentum(std::numeric_limits<float>::max());
         try
         {
             for (StringVector::const_iterator iter = m_settings.m_TrackRelationCollections.begin(), iterEnd = m_settings.m_TrackRelationCollections.end(); iter != iterEnd; ++iter)
             {
                 if(collectionMaps.collectionMap_TrkRel.find(*iter) == collectionMaps.collectionMap_TrkRel.end()) continue;
-                const std::vector<edm4hep::MCRecoTrackerAssociation>& pMCRecoTrackerAssociationCollection = (collectionMaps.collectionMap_TrkRel.find(*iter))->second;
+                auto pMCRecoTrackerAssociationCollection = (collectionMaps.collectionMap_TrkRel.find(*iter))->second;
                 for(unsigned ith=0 ; ith<pTrack->trackerHits_size(); ith++)
                 {
                     for(unsigned ic=0; ic < pMCRecoTrackerAssociationCollection.size(); ic++)
                     {
                         if( pMCRecoTrackerAssociationCollection.at(ic).getRec().id() != pTrack->getTrackerHits(ith).id() ) continue;
-                        const edm4hep::ConstSimTrackerHit pSimHit = pMCRecoTrackerAssociationCollection.at(ic).getSim();
-                        const edm4hep::ConstMCParticle ipa = pSimHit.getMCParticle();
+                        auto pSimHit = pMCRecoTrackerAssociationCollection.at(ic).getSim();
+                        auto ipa = pSimHit.getMCParticle();
                         if( m_id_pMC_map->find(ipa.id()) == m_id_pMC_map->end() ) continue;
                         const float trueMomentum(pandora::CartesianVector(ipa.getMomentum()[0], ipa.getMomentum()[1], ipa.getMomentum()[2]).GetMagnitude());
                         const float deltaMomentum(std::fabs(recoMomentum - trueMomentum));
                         if (deltaMomentum < bestDeltaMomentum)
                         {
-                            pBestMCParticle =const_cast<edm4hep::MCParticle*>((*m_id_pMC_map)[ipa.id()]);
+                            pBestMCParticle =((*m_id_pMC_map)[ipa.id()]);
                             bestDeltaMomentum = deltaMomentum;
                         }
                     }
diff --git a/Reconstruction/PFA/Pandora/GaudiPandora/src/PandoraPFAlg.cpp b/Reconstruction/PFA/Pandora/GaudiPandora/src/PandoraPFAlg.cpp
index 18030dbdb33cf0a5f62876fe64e237e550753855..0e16f4e61e09dc01e9913d8349585045f99a3ec7 100644
--- a/Reconstruction/PFA/Pandora/GaudiPandora/src/PandoraPFAlg.cpp
+++ b/Reconstruction/PFA/Pandora/GaudiPandora/src/PandoraPFAlg.cpp
@@ -479,8 +479,8 @@ StatusCode PandoraPFAlg::updateMap()
                 auto handle = dynamic_cast<DataHandle<edm4hep::MCParticleCollection>*> (v.second);
                 auto po = handle->get();
                 if(po != NULL){
-                    std::vector<edm4hep::MCParticle> v_mc;
-                    m_CollectionMaps->collectionMap_MC [v.first] = v_mc;
+                    // std::vector<edm4hep::MCParticle> v_mc;
+                    // m_CollectionMaps->collectionMap_MC [v.first] = v_mc;
                     for(unsigned int i=0 ; i< po->size(); i++) m_CollectionMaps->collectionMap_MC [v.first].push_back(po->at(i));
                     debug()<<"saved col name="<<v.first<<endmsg;
                 }
@@ -493,8 +493,8 @@ StatusCode PandoraPFAlg::updateMap()
                 auto handle = dynamic_cast<DataHandle<edm4hep::CalorimeterHitCollection>*> (v.second);
                 auto po = handle->get();
                 if(po != NULL){
-                    std::vector<edm4hep::CalorimeterHit> v_cal;
-                    m_CollectionMaps->collectionMap_CaloHit[v.first] = v_cal ;
+                    // std::vector<edm4hep::CalorimeterHit> v_cal;
+                    // m_CollectionMaps->collectionMap_CaloHit[v.first] = v_cal ;
                     for(unsigned int i=0 ; i< po->size(); i++) m_CollectionMaps->collectionMap_CaloHit [v.first].push_back(po->at(i));
                     debug()<<"saved col name="<<v.first<<endmsg;
                 }
@@ -507,8 +507,8 @@ StatusCode PandoraPFAlg::updateMap()
                 auto handle = dynamic_cast<DataHandle<edm4hep::TrackCollection>*> (v.second);
                 auto po = handle->get();
                 if(po != NULL){
-                    std::vector<edm4hep::Track> v_cal;
-                    m_CollectionMaps->collectionMap_Track[v.first] = v_cal ;
+                    // std::vector<edm4hep::Track> v_cal;
+                    // m_CollectionMaps->collectionMap_Track[v.first] = v_cal ;
                     for(unsigned int i=0 ; i< po->size(); i++) m_CollectionMaps->collectionMap_Track [v.first].push_back(po->at(i));
                     debug() <<"saved col name="<<v.first<<endmsg;
                     m_marlinTrack = po->size();
@@ -522,8 +522,8 @@ StatusCode PandoraPFAlg::updateMap()
                 auto handle = dynamic_cast<DataHandle<edm4hep::VertexCollection>*> (v.second);
                 auto po = handle->get();
                 if(po != NULL){
-                    std::vector<edm4hep::Vertex> v_cal;
-                    m_CollectionMaps->collectionMap_Vertex[v.first] = v_cal ;
+                    // std::vector<edm4hep::Vertex> v_cal;
+                    // m_CollectionMaps->collectionMap_Vertex[v.first] = v_cal ;
                     for(unsigned int i=0 ; i< po->size(); i++) m_CollectionMaps->collectionMap_Vertex [v.first].push_back(po->at(i));
                     debug() <<"saved col name="<<v.first<<endmsg;
                 }
@@ -536,8 +536,8 @@ StatusCode PandoraPFAlg::updateMap()
                 auto handle = dynamic_cast<DataHandle<edm4hep::MCRecoCaloAssociationCollection>*> (v.second);
                 auto po = handle->get();
                 if(po != NULL){
-                    std::vector<edm4hep::MCRecoCaloAssociation> v_cal;
-                    m_CollectionMaps->collectionMap_CaloRel[v.first] = v_cal ;
+                    // std::vector<edm4hep::MCRecoCaloAssociation> v_cal;
+                    // m_CollectionMaps->collectionMap_CaloRel[v.first] = v_cal ;
                     for(unsigned int i=0 ; i< po->size(); i++) m_CollectionMaps->collectionMap_CaloRel [v.first].push_back(po->at(i));
                     debug() <<"saved col name="<<v.first<<endmsg;
                 }
@@ -550,8 +550,8 @@ StatusCode PandoraPFAlg::updateMap()
                 auto handle = dynamic_cast<DataHandle<edm4hep::MCRecoTrackerAssociationCollection>*> (v.second);
                 auto po = handle->get();
                 if(po != NULL){
-                    std::vector<edm4hep::MCRecoTrackerAssociation> v_cal;
-                    m_CollectionMaps->collectionMap_TrkRel[v.first] = v_cal ;
+                    // std::vector<edm4hep::MCRecoTrackerAssociation> v_cal;
+                    // m_CollectionMaps->collectionMap_TrkRel[v.first] = v_cal ;
                     for(unsigned int i=0 ; i< po->size(); i++) m_CollectionMaps->collectionMap_TrkRel [v.first].push_back(po->at(i));
                     debug() <<"saved col name="<<v.first<<endmsg;
                 }
@@ -584,7 +584,7 @@ StatusCode PandoraPFAlg::Ana()
     for(int i=0; i<reco_col->size();i++)
     {
         if( m_n_rec >= m_max_rec) break;
-        const edm4hep::ReconstructedParticle pReco = reco_col->at(i);
+        auto pReco = reco_col->at(i);
         const float px = pReco.getMomentum()[0];
         const float py = pReco.getMomentum()[1];
         const float pz = pReco.getMomentum()[2];
@@ -656,19 +656,19 @@ StatusCode PandoraPFAlg::CreateMCRecoParticleAssociation()
         std::map<int, edm4hep::ConstMCParticle> mc_map;
         std::map<int, float > id_edep_map;
         float tot_en = 0 ;
-        const edm4hep::ReconstructedParticle pReco = reco_col->at(i);
+        auto pReco = reco_col->at(i);
         for(int j=0; j < pReco.clusters_size(); j++)
         {
             edm4hep::ConstCluster cluster = pReco.getClusters(j);
             for(int k=0; k < cluster.hits_size(); k++)
             {
                 edm4hep::ConstCalorimeterHit hit = cluster.getHits(k);
-                for(std::map<std::string, std::vector<edm4hep::MCRecoCaloAssociation> >::iterator iter = m_CollectionMaps->collectionMap_CaloRel.begin(); iter != m_CollectionMaps->collectionMap_CaloRel.end(); iter++)
+                for(auto iter = m_CollectionMaps->collectionMap_CaloRel.begin(); iter != m_CollectionMaps->collectionMap_CaloRel.end(); iter++)
                 {
-                    for(std::vector<edm4hep::MCRecoCaloAssociation>::iterator it = iter->second.begin(); it != iter->second.end(); it ++)
+                    for(auto it = iter->second.begin(); it != iter->second.end(); it ++)
                     {
                         if(it->getRec().id() != hit.id()) continue;
-                        for(std::vector<edm4hep::ConstCaloHitContribution>::const_iterator itc = it->getSim().contributions_begin(); itc != it->getSim().contributions_end(); itc++)
+                        for(auto itc = it->getSim().contributions_begin(); itc != it->getSim().contributions_end(); itc++)
                         {
                             if(mc_map.find(itc->getParticle().id()) == mc_map.end()) mc_map[itc->getParticle().id()] = itc->getParticle() ;
                             if(id_edep_map.find(itc->getParticle().id()) != id_edep_map.end()) id_edep_map[itc->getParticle().id()] = id_edep_map[itc->getParticle().id()] + itc->getEnergy() ;
@@ -679,7 +679,7 @@ StatusCode PandoraPFAlg::CreateMCRecoParticleAssociation()
                 }
             }
         }
-        for(std::map<int, edm4hep::ConstMCParticle>::iterator it = mc_map.begin(); it != mc_map.end(); it ++)
+        for(auto it = mc_map.begin(); it != mc_map.end(); it ++)
         {      
             edm4hep::MCRecoParticleAssociation association = pMCRecoParticleAssociationCollection->create();
             association.setRec(pReco);
diff --git a/Reconstruction/PFA/Pandora/GaudiPandora/src/TrackCreator.cpp b/Reconstruction/PFA/Pandora/GaudiPandora/src/TrackCreator.cpp
index 4b67db277fcb73218e559c6acd1521b7a28a637f..82d60b63a231b85bc5ca2cf29a6b8dc6f1a68b7c 100644
--- a/Reconstruction/PFA/Pandora/GaudiPandora/src/TrackCreator.cpp
+++ b/Reconstruction/PFA/Pandora/GaudiPandora/src/TrackCreator.cpp
@@ -291,20 +291,20 @@ pandora::StatusCode TrackCreator::ExtractKinks(const CollectionMaps& collectionM
         if(collectionMaps.collectionMap_Vertex.find(*iter) == collectionMaps.collectionMap_Vertex.end()) { std::cout<<"not find "<<(*iter)<<std::endl; continue;}
         try
         {
-            const std::vector<edm4hep::Vertex>& pKinkCollection = (collectionMaps.collectionMap_Vertex.find(*iter))->second;
+            auto pKinkCollection = (collectionMaps.collectionMap_Vertex.find(*iter))->second;
 
             for (int i = 0, iMax = pKinkCollection.size(); i < iMax; ++i)
             {
                 try
                 {
-                    const edm4hep::Vertex  pVertex0 = pKinkCollection.at(i);
-                    const edm4hep::Vertex* pVertex  = &(pVertex0);
+                    auto  pVertex0 = pKinkCollection.at(i);
+                    auto pVertex  = &(pVertex0);
 
                     if (NULL == pVertex) throw ("Collection type mismatch");
 
                     //std::cout<<"pVertex getChi2="<<pVertex->getChi2()<<std::endl;
                     //std::cout<<"pReconstructedParticle en="<<pReconstructedParticle.getEnergy()<<",type="<<pReconstructedParticle.getType()<<std::endl;
-                    const edm4hep::ConstReconstructedParticle pReconstructedParticle = pVertex->getAssociatedParticle();
+                    auto pReconstructedParticle = pVertex->getAssociatedParticle();
                     if (this->IsConflictingRelationship(pReconstructedParticle))continue;
 
                     const int vertexPdgCode(pReconstructedParticle.getType());
@@ -312,7 +312,7 @@ pandora::StatusCode TrackCreator::ExtractKinks(const CollectionMaps& collectionM
                     // Extract the kink vertex information
                     for (unsigned int iTrack = 0, nTracks = pReconstructedParticle.tracks_size(); iTrack < nTracks; ++iTrack)
                     {
-                        edm4hep::ConstTrack pTrack = pReconstructedParticle.getTracks(iTrack);
+                        auto pTrack = pReconstructedParticle.getTracks(iTrack);
                         (0 == iTrack) ? m_parentTrackList.insert(pTrack.id()) : m_daughterTrackList.insert(pTrack.id());
 
                         int trackPdgCode = pandora::UNKNOWN_PARTICLE_TYPE;
@@ -395,14 +395,14 @@ pandora::StatusCode TrackCreator::ExtractProngsAndSplits(const CollectionMaps& c
         if(collectionMaps.collectionMap_Vertex.find(*iter) == collectionMaps.collectionMap_Vertex.end()) { std::cout<<"not find "<<(*iter)<<std::endl; continue;}
         try
         {
-            const std::vector<edm4hep::Vertex>& pProngOrSplitCollection = (collectionMaps.collectionMap_Vertex.find(*iter))->second;
+            auto pProngOrSplitCollection = (collectionMaps.collectionMap_Vertex.find(*iter))->second;
 
             for (int i = 0, iMax = pProngOrSplitCollection.size(); i < iMax; ++i)
             {
                 try
                 {
-                    const edm4hep::Vertex  pVertex0 = pProngOrSplitCollection.at(i);
-                    const edm4hep::Vertex* pVertex  = &(pVertex0);
+                    auto  pVertex0 = pProngOrSplitCollection.at(i);
+                    auto pVertex  = &(pVertex0);
 
                     if (NULL == pVertex) throw ("Collection type mismatch");
                     const edm4hep::ConstReconstructedParticle pReconstructedParticle = pVertex->getAssociatedParticle();
@@ -461,14 +461,14 @@ pandora::StatusCode TrackCreator::ExtractV0s(const CollectionMaps& collectionMap
         if(collectionMaps.collectionMap_Vertex.find(*iter) == collectionMaps.collectionMap_Vertex.end()) { std::cout<<"not find "<<(*iter)<<std::endl; continue;}
         try
         {
-            const std::vector<edm4hep::Vertex>& pV0Collection = (collectionMaps.collectionMap_Vertex.find(*iter))->second;
+            auto pV0Collection = (collectionMaps.collectionMap_Vertex.find(*iter))->second;
 
             for (int i = 0, iMax = pV0Collection.size(); i < iMax; ++i)
             {
                 try
                 {
-                    const edm4hep::Vertex  pVertex0 = pV0Collection.at(i);
-                    const edm4hep::Vertex* pVertex  = &(pVertex0);
+                    auto  pVertex0 = pV0Collection.at(i);
+                    auto  pVertex  = &(pVertex0);
 
                     if (NULL == pVertex) throw ("Collection type mismatch");
 
@@ -547,16 +547,16 @@ bool TrackCreator::IsConflictingRelationship(const edm4hep::ConstReconstructedPa
     return false;
 }
 
-const edm4hep::Track* TrackCreator::GetTrackAddress(const CollectionMaps& collectionMaps, const edm4hep::ConstTrack& pTrack )
+edm4hep::ConstTrack* TrackCreator::GetTrackAddress(const CollectionMaps& collectionMaps, const edm4hep::ConstTrack& pTrack )
 {
     for (StringVector::const_iterator iter = m_settings.m_trackCollections.begin(), iterEnd = m_settings.m_trackCollections.end(); iter != iterEnd; ++iter)
     {
         if(collectionMaps.collectionMap_Track.find(*iter) == collectionMaps.collectionMap_Track.end()) { std::cout<<"not find "<<(*iter)<<std::endl; continue;}
-        const std::vector<edm4hep::Track>& pTrackCollection = (collectionMaps.collectionMap_Track.find(*iter))->second;
+        auto pTrackCollection = (collectionMaps.collectionMap_Track.find(*iter))->second;
         for (int i = 0, iMax = pTrackCollection.size(); i < iMax; ++i)
         {
-            const edm4hep::Track& pTrack0 = pTrackCollection.at(i);
-            if (pTrack.id() == pTrack0.id()) return (const edm4hep::Track*) (&pTrack0);
+            auto pTrack0 = pTrackCollection.at(i);
+            if (pTrack.id() == pTrack0.id()) return (&pTrack0);
         }
     }
     return NULL;
@@ -572,20 +572,20 @@ pandora::StatusCode TrackCreator::CreateTracks(const CollectionMaps& collectionM
         if(collectionMaps.collectionMap_Track.find(*iter) == collectionMaps.collectionMap_Track.end()) { std::cout<<"not find "<<(*iter)<<std::endl; continue;}
         try
         {
-            const std::vector<edm4hep::Track>& pTrackCollection = (collectionMaps.collectionMap_Track.find(*iter))->second;
+            auto pTrackCollection = (collectionMaps.collectionMap_Track.find(*iter))->second;
 
             if(m_settings.m_debug) std::cout<<"TrackSize:"<<pTrackCollection.size()<<std::endl;
             for (int i = 0, iMax = pTrackCollection.size(); i < iMax; ++i)
             {
                 try
                 {
-                    const edm4hep::Track& pTrack0 = pTrackCollection.at(i);
-                    const edm4hep::Track* pTrack  = (const edm4hep::Track*)(&pTrack0);
+                    auto pTrack0 = pTrackCollection.at(i);
+                    auto pTrack  = (&pTrack0);
 
                     if (NULL == pTrack) throw ("Collection type mismatch");
                     if(m_settings.m_debug){
                         for(int ip=0; ip<pTrack->trackStates_size(); ip++){
-                            edm4hep::TrackState tmp_pTrackState = pTrack->getTrackStates(ip);
+                            auto tmp_pTrackState = pTrack->getTrackStates(ip);
                             const double tmp_pt(m_bField * 2.99792e-4 / std::fabs(tmp_pTrackState.omega));
                             edm4hep::Vector3f pref = tmp_pTrackState.referencePoint;
                             std::cout<<"ip="<<ip<<",pt=" << tmp_pt <<",refx="<<pref[0]<<",refy="<<pref[1]<<",refz="<<pref[2]<<",tanLambda=" << tmp_pTrackState.tanLambda<<",D0="<<tmp_pTrackState.D0<<",Z0="<<tmp_pTrackState.Z0<<",phi="<<tmp_pTrackState.phi<< std::endl;
@@ -665,7 +665,7 @@ pandora::StatusCode TrackCreator::CreateTracks(const CollectionMaps& collectionM
 
 //------------------------------------------------------------------------------------------------------------------------------------------
 
-void TrackCreator::GetTrackStates(const edm4hep::Track *const pTrack, PandoraApi::Track::Parameters &trackParameters) const
+void TrackCreator::GetTrackStates(edm4hep::ConstTrack *const pTrack, PandoraApi::Track::Parameters &trackParameters) const
 {
     // for DD4HEP, 0 is IP, 1 is AtFirstHit, 2 is AtLastHit, 3 is AtCalo
     edm4hep::TrackState pTrackState = pTrack->getTrackStates(0); 
@@ -691,7 +691,7 @@ void TrackCreator::GetTrackStates(const edm4hep::Track *const pTrack, PandoraApi
 
 //------------------------------------------------------------------------------------------------------------------------------------------
 
-float TrackCreator::CalculateTrackTimeAtCalorimeter(const edm4hep::Track *const pTrack) const
+float TrackCreator::CalculateTrackTimeAtCalorimeter(edm4hep::ConstTrack *const pTrack) const
 {
     const pandora::Helix helix(pTrack->getTrackStates(0).phi, pTrack->getTrackStates(0).D0, pTrack->getTrackStates(0).Z0, pTrack->getTrackStates(0).omega, pTrack->getTrackStates(0).tanLambda, m_bField);
     const pandora::CartesianVector &referencePoint(helix.GetReferencePoint());
@@ -764,7 +764,7 @@ void TrackCreator::CopyTrackState(const edm4hep::TrackState & pTrackState, pando
 
 //------------------------------------------------------------------------------------------------------------------------------------------
 
-void TrackCreator::TrackReachesECAL(const edm4hep::Track *const pTrack, PandoraApi::Track::Parameters &trackParameters) const
+void TrackCreator::TrackReachesECAL(edm4hep::ConstTrack *const pTrack, PandoraApi::Track::Parameters &trackParameters) const
 {
     
     // Calculate hit position information
@@ -847,7 +847,7 @@ void TrackCreator::TrackReachesECAL(const edm4hep::Track *const pTrack, PandoraA
 
 //------------------------------------------------------------------------------------------------------------------------------------------
 
-void TrackCreator::DefineTrackPfoUsage(const edm4hep::Track *const pTrack, PandoraApi::Track::Parameters &trackParameters) const
+void TrackCreator::DefineTrackPfoUsage(edm4hep::ConstTrack *const pTrack, PandoraApi::Track::Parameters &trackParameters) const
 {
     bool canFormPfo(false);
     bool canFormClusterlessPfo(false);
@@ -858,7 +858,7 @@ void TrackCreator::DefineTrackPfoUsage(const edm4hep::Track *const pTrack, Pando
 
         float rInner(std::numeric_limits<float>::max()), zMin(std::numeric_limits<float>::max());
 
-        for (std::vector<edm4hep::ConstTrackerHit>::const_iterator iter = pTrack->trackerHits_begin(), iterEnd = pTrack->trackerHits_end(); iter != iterEnd; ++iter)
+        for (auto iter = pTrack->trackerHits_begin(), iterEnd = pTrack->trackerHits_end(); iter != iterEnd; ++iter)
         {
             const edm4hep::Vector3d pPosition = (*iter).getPosition(); 
             const float x(pPosition[0]), y(pPosition[1]), absoluteZ(std::fabs(pPosition[2]));
@@ -932,7 +932,7 @@ void TrackCreator::DefineTrackPfoUsage(const edm4hep::Track *const pTrack, Pando
 
 //------------------------------------------------------------------------------------------------------------------------------------------
 
-bool TrackCreator::PassesQualityCuts(const edm4hep::Track *const pTrack, const PandoraApi::Track::Parameters &trackParameters) const
+bool TrackCreator::PassesQualityCuts(edm4hep::ConstTrack *const pTrack, const PandoraApi::Track::Parameters &trackParameters) const
 {
     // First simple sanity checks
     if (trackParameters.m_trackStateAtCalorimeter.Get().GetPosition().GetMagnitude() < m_settings.m_minTrackECalDistanceFromIp)
@@ -1009,7 +1009,7 @@ bool TrackCreator::PassesQualityCuts(const edm4hep::Track *const pTrack, const P
 
 //------------------------------------------------------------------------------------------------------------------------------------------
 
-int TrackCreator::GetNTpcHits(const edm4hep::Track *const pTrack) const
+int TrackCreator::GetNTpcHits(edm4hep::ConstTrack *const pTrack) const
 {
     // ATTN
     //fg: hit numbers are now given in different order wrt LOI:  
@@ -1028,7 +1028,7 @@ int TrackCreator::GetNTpcHits(const edm4hep::Track *const pTrack) const
 
 //------------------------------------------------------------------------------------------------------------------------------------------
 
-int TrackCreator::GetNFtdHits(const edm4hep::Track *const pTrack) const
+int TrackCreator::GetNFtdHits(edm4hep::ConstTrack *const pTrack) const
 {
     // ATTN
     //fg: hit numbers are now given in different order wrt LOI: