diff --git a/Tracking/TrkAlgorithms/TrkTrackCollectionMerger/TrkTrackCollectionMerger/TrackCollectionMerger.h b/Tracking/TrkAlgorithms/TrkTrackCollectionMerger/TrkTrackCollectionMerger/TrackCollectionMerger.h
new file mode 100644
index 0000000000000000000000000000000000000000..8c25275904f67f93d28fa0bdaf5520d620350930
--- /dev/null
+++ b/Tracking/TrkAlgorithms/TrkTrackCollectionMerger/TrkTrackCollectionMerger/TrackCollectionMerger.h
@@ -0,0 +1,80 @@
+/*
+ Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
+*/
+
+///////////////////////////////////////////////////////////////////
+// TrackCollectionMerger.h, (c) ATLAS Detector software
+///////////////////////////////////////////////////////////////////
+#ifndef TrackCollectionMerger_H
+#define TrackCollectionMerger_H
+
+#include <string>
+#include <map>
+#include "AthenaBaseComps/AthAlgorithm.h"
+#include "GaudiKernel/ToolHandle.h"
+
+#include "TrkTrack/TrackCollection.h"
+
+#include "TrkToolInterfaces/ITrackSummaryTool.h"
+#include "TrkToolInterfaces/IPRD_AssociationTool.h"
+
+namespace Trk {
+
+ /** @brief Class-algorithm for track collection merging and removalof potential duplicate tracks. */
+ class TrackCollectionMerger : public AthAlgorithm
+ {
+
+ ///////////////////////////////////////////////////////////////////
+ /** @brief Public methods: */
+ ///////////////////////////////////////////////////////////////////
+
+ public:
+
+ ///////////////////////////////////////////////////////////////////
+ /** @brief Standard Algotithm methods: */
+ ///////////////////////////////////////////////////////////////////
+
+ TrackCollectionMerger(const std::string &name, ISvcLocator *pSvcLocator);
+ virtual ~TrackCollectionMerger() {}
+ StatusCode initialize();
+ StatusCode execute();
+ StatusCode finalize();
+
+ ///////////////////////////////////////////////////////////////////
+ /** @brief Print internal tool parameters and status. */
+ ///////////////////////////////////////////////////////////////////
+
+ MsgStream& dump (MsgStream& out) const;
+ std::ostream& dump (std::ostream& out) const;
+
+ protected:
+
+ ///////////////////////////////////////////////////////////////////
+ /** @brief Protected data: */
+ ///////////////////////////////////////////////////////////////////
+ std::vector<std::string> m_tracklocation ; /** Vector of track collections to be merged. */
+ std::string m_outtracklocation ; /** Combined track collection. */
+
+ ToolHandle< Trk::IPRD_AssociationTool > m_assoTool ; /** association tool for PRDs */
+ ToolHandle< Trk::ITrackSummaryTool > m_trkSummaryTool ; /** summary tool with shared hits enabled */
+
+ ///////////////////////////////////////////////////////////////////
+ /** @brief Protected methods: */
+ ///////////////////////////////////////////////////////////////////
+
+ /** @brief A routine that merges the track collections. */
+ StatusCode mergeTrack(const TrackCollection* trackCol, TrackCollection* outputCol);
+
+ MsgStream& dumptools(MsgStream& out) const;
+ MsgStream& dumpevent(MsgStream& out) const;
+
+ private:
+ bool m_createViewCollection; //!< option to create a view collection and not deep-copy tracks
+ bool m_updateSharedHitsOnly; //!< do not create the track summary again, but only update shared hits
+
+ };
+
+ MsgStream& operator << (MsgStream& ,const TrackCollectionMerger&);
+ std::ostream& operator << (std::ostream&,const TrackCollectionMerger&);
+}
+#endif // TrackCollectionMerger_H
diff --git a/Tracking/TrkAlgorithms/TrkTrackCollectionMerger/cmt/requirements b/Tracking/TrkAlgorithms/TrkTrackCollectionMerger/cmt/requirements
new file mode 100644
index 0000000000000000000000000000000000000000..e5399e3527fb7842d50594faf557a56fc33424af
--- /dev/null
+++ b/Tracking/TrkAlgorithms/TrkTrackCollectionMerger/cmt/requirements
@@ -0,0 +1,18 @@
+package TrkTrackCollectionMerger
+
+author Thomas Koffas <Thomas.Koffas@cern.ch>
+
+private
+
+use TrkPrepRawData TrkPrepRawData-* Tracking/TrkEvent
+
+public
+
+use AtlasPolicy AtlasPolicy-*
+use GaudiInterface GaudiInterface-* External
+use AthenaBaseComps AthenaBaseComps-* Control
+use TrkTrack TrkTrack-* Tracking/TrkEvent
+use TrkToolInterfaces TrkToolInterfaces-* Tracking/TrkTools
+
+library TrkTrackCollectionMerger *.cxx components/*.cxx
+apply_pattern component_library
diff --git a/Tracking/TrkAlgorithms/TrkTrackCollectionMerger/doc/mainpage.h b/Tracking/TrkAlgorithms/TrkTrackCollectionMerger/doc/mainpage.h
new file mode 100755
index 0000000000000000000000000000000000000000..84ef8c52adddd44b5a7938f2a8644f22ee45b161
--- /dev/null
+++ b/Tracking/TrkAlgorithms/TrkTrackCollectionMerger/doc/mainpage.h
@@ -0,0 +1,48 @@
+/*
+ Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
+*/
+
+/**
+
+@mainpage TrkTrackCollectionMerger
+@author Thomas.Koffas@cern.ch
+
+@section TrkTrackCollectionMergerIntro Introduction
+
+This is an algorithm that merges all individual track collections,
+SiSeededTracks, back-tracks, standalone TRT tracks etc. It runs at
+the end of the tracking and before the post processing. It ouputs
+a global track collection.
+
+@section TrkTrackCollectionMergerDescription Description
+
+This algorithm performs the following tasks:
+
+1. Loops over the input vector of all available track collections.
+ For each track collection, the track are saved in a common track
+ container that will be stored for later usage. The hit association
+ tool also gets updated simultaneuosly.
+
+2. Using the new common track collection, that track summary tool is then
+ updated.
+
+3. The new collection is stored.
+
+@section TrkTrackCollectionMergerTools Used Tools
+
+This algorithm uses the ITrackSummaryTool, IPRD_AssociationTool tools.
+
+@section TrkTrackCollectionMergerContents Algorithm Contents
+
+The TrkTrackCollectionMerger contains the following classes/files:
+
+- TrkTrackCollectionMerger.cxx...Main class calling all the necessary tools and producing the ouput track collection.
+
+@section TrkTrackCollectionMergerPackages Used Packages
+
+@htmlinclude used_packages.html
+
+@section TrkTrackCollectionMergerReq Requirements file
+@include requirements
+
+*/
diff --git a/Tracking/TrkAlgorithms/TrkTrackCollectionMerger/src/TrackCollectionMerger.cxx b/Tracking/TrkAlgorithms/TrkTrackCollectionMerger/src/TrackCollectionMerger.cxx
new file mode 100644
index 0000000000000000000000000000000000000000..f261faa74152a3d0dd9a94c0c42774615b200fd5
--- /dev/null
+++ b/Tracking/TrkAlgorithms/TrkTrackCollectionMerger/src/TrackCollectionMerger.cxx
@@ -0,0 +1,217 @@
+/*
+ Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
+*/
+
+///////////////////////////////////////////////////////////////////
+// Implementation file for class Trk::TrackCollectionMerger
+///////////////////////////////////////////////////////////////////
+// (c) ATLAS Detector software
+///////////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////
+// Version 1.0 11/26/2007 Thomas Koffas
+///////////////////////////////////////////////////////////////////
+
+#include "GaudiKernel/MsgStream.h"
+#include "TrkPrepRawData/PrepRawData.h"
+#include "TrkTrackCollectionMerger/TrackCollectionMerger.h"
+
+///////////////////////////////////////////////////////////////////
+// Constructor
+///////////////////////////////////////////////////////////////////
+
+Trk::TrackCollectionMerger::TrackCollectionMerger
+(const std::string& name, ISvcLocator* pSvcLocator ) :
+ AthAlgorithm(name, pSvcLocator ),
+ m_createViewCollection(true),
+ m_updateSharedHitsOnly(true)
+{
+ m_outtracklocation = "CombinedInDetTracks" ;
+
+ declareProperty("TracksLocation", m_tracklocation );
+ declareProperty("OutputTracksLocation", m_outtracklocation );
+ declareProperty("AssoTool", m_assoTool );
+ declareProperty("SummaryTool" , m_trkSummaryTool );
+ declareProperty("CreateViewColllection" , m_createViewCollection );
+ declareProperty("UpdateSharedHitsOnly" , m_updateSharedHitsOnly);
+
+}
+
+///////////////////////////////////////////////////////////////////
+// Initialisation
+///////////////////////////////////////////////////////////////////
+
+StatusCode Trk::TrackCollectionMerger::initialize()
+{
+
+ ATH_MSG_DEBUG("Initializing TrackCollectionMerger");
+
+ if ( m_assoTool.retrieve().isFailure() ) {
+ msg(MSG::FATAL) << "Failed to retrieve tool " << m_assoTool << endreq;
+ return StatusCode::FAILURE;
+ } else
+ ATH_MSG_INFO("Retrieved tool " << m_assoTool);
+
+ if (m_trkSummaryTool.retrieve().isFailure()) {
+ msg(MSG::FATAL) << "Failed to retrieve tool " << m_trkSummaryTool << endreq;
+ return StatusCode::FAILURE;
+ } else
+ ATH_MSG_INFO("Retrieved tool " << m_trkSummaryTool);
+
+ return StatusCode::SUCCESS;
+}
+
+
+///////////////////////////////////////////////////////////////////
+// Execute
+///////////////////////////////////////////////////////////////////
+StatusCode Trk::TrackCollectionMerger::execute()
+{
+ // clean up association tool
+ m_assoTool->reset();
+
+ // out output track collection
+ TrackCollection* outputCol = m_createViewCollection ?
+ new TrackCollection(SG::VIEW_ELEMENTS) : new TrackCollection;
+ ATH_MSG_DEBUG("Number of Track collections " << m_tracklocation.size());
+
+ // pre-loop to reserve enough space in the output collection
+ std::vector<const TrackCollection*> trackCollections;
+ trackCollections.reserve(m_tracklocation.size());
+ size_t ttNumber = 0;
+ for (auto& tcname : m_tracklocation){
+ const TrackCollection* trackCol;
+ ///Retrieve forward tracks from StoreGate
+ if (evtStore()->retrieve(trackCol,tcname).isFailure()){
+ ATH_MSG_DEBUG("No tracks with name " << tcname);
+ } else {
+ ATH_MSG_DEBUG("Found track collection " << tcname );
+ trackCollections.push_back(trackCol);
+ ttNumber += trackCol->size();
+ }
+ }
+ // reserve the right number of entries for the output collection
+ outputCol->reserve(ttNumber);
+ // merging loop
+ for(auto& tciter : trackCollections){
+ // merge them in
+ if(mergeTrack(tciter,outputCol).isFailure()){
+ ATH_MSG_ERROR( "Failed to merge tracks! ");
+ }
+ }
+
+ ATH_MSG_DEBUG("Size of combined tracks " << outputCol->size());
+ if( evtStore()->record(outputCol,m_outtracklocation,false).isFailure() ){
+ ATH_MSG_ERROR("Could not save the reconstructed TRT seeded Si tracks!");
+ return StatusCode::FAILURE ;
+ }
+
+ ATH_MSG_DEBUG("Update summaries");
+ // now loop over all tracks and update summaries with new shared hit counts
+ TrackCollection::iterator rf = outputCol->begin();
+ TrackCollection::iterator rfE = outputCol->end();
+ for( ; rf != rfE; ++rf){
+ if (m_updateSharedHitsOnly) m_trkSummaryTool->updateSharedHitCount(**rf);
+ else m_trkSummaryTool->updateTrack(**rf);
+ }
+
+ //Print common event information
+ if(msgLvl(MSG::DEBUG)){
+ ATH_MSG_DEBUG((*this));
+ }
+
+ ATH_MSG_DEBUG("Done !");
+ return StatusCode::SUCCESS;
+}
+
+///////////////////////////////////////////////////////////////////
+// Finalize
+///////////////////////////////////////////////////////////////////
+
+StatusCode Trk::TrackCollectionMerger::finalize()
+{
+ return StatusCode::SUCCESS;
+}
+
+///////////////////////////////////////////////////////////////////
+// Dumps relevant information into the MsgStream
+///////////////////////////////////////////////////////////////////
+
+MsgStream& Trk::TrackCollectionMerger::dump( MsgStream& out ) const
+{
+ out<<std::endl;
+ if(msgLvl(MSG::DEBUG)) return dumpevent(out);
+ return dumptools(out);
+}
+
+///////////////////////////////////////////////////////////////////
+// Dumps conditions information into the MsgStream
+///////////////////////////////////////////////////////////////////
+
+MsgStream& Trk::TrackCollectionMerger::dumptools( MsgStream& out ) const
+{
+ return out;
+}
+
+///////////////////////////////////////////////////////////////////
+// Dumps event information into the MsgStream
+///////////////////////////////////////////////////////////////////
+
+MsgStream& Trk::TrackCollectionMerger::dumpevent( MsgStream& out ) const
+{
+ return out;
+}
+
+///////////////////////////////////////////////////////////////////
+// Dumps relevant information into the ostream
+///////////////////////////////////////////////////////////////////
+
+std::ostream& Trk::TrackCollectionMerger::dump( std::ostream& out ) const
+{
+ return out;
+}
+
+///////////////////////////////////////////////////////////////////
+// Overload of << operator MsgStream
+///////////////////////////////////////////////////////////////////
+
+MsgStream& Trk::operator <<
+ (MsgStream& sl,const Trk::TrackCollectionMerger& se)
+{
+ return se.dump(sl);
+}
+
+///////////////////////////////////////////////////////////////////
+// Overload of << operator std::ostream
+///////////////////////////////////////////////////////////////////
+
+std::ostream& Trk::operator <<
+ (std::ostream& sl,const Trk::TrackCollectionMerger& se)
+{
+ return se.dump(sl);
+}
+
+
+///////////////////////////////////////////////////////////////////
+// Merge track collections and remove duplicates
+///////////////////////////////////////////////////////////////////
+
+StatusCode Trk::TrackCollectionMerger::mergeTrack(const TrackCollection* trackCol, TrackCollection* outputCol)
+{
+ // loop over forward track, accept them and add them imto association tool
+ if(trackCol && trackCol->size()) {
+ ATH_MSG_DEBUG("Size of track collection " << trackCol->size());
+
+ // loop over tracks
+ for(auto& rf: *trackCol){
+ // add track into output
+ Trk::Track* newTrack = m_createViewCollection ? rf : new Trk::Track(*rf);
+ outputCol->push_back(newTrack);
+ // add tracks into PRD tool
+ if (m_assoTool->addPRDs(*newTrack).isFailure())
+ msg(MSG::WARNING) << "Failed to add PRDs to map" << endreq;
+ }
+ }
+
+ return StatusCode::SUCCESS;
+}
+
diff --git a/Tracking/TrkAlgorithms/TrkTrackCollectionMerger/src/components/TrkTrackCollectionMerger_entries.cxx b/Tracking/TrkAlgorithms/TrkTrackCollectionMerger/src/components/TrkTrackCollectionMerger_entries.cxx
new file mode 100644
index 0000000000000000000000000000000000000000..734e7a343985e80ef7c82a4a15645581edaf6e78
--- /dev/null
+++ b/Tracking/TrkAlgorithms/TrkTrackCollectionMerger/src/components/TrkTrackCollectionMerger_entries.cxx
@@ -0,0 +1,12 @@
+#include "GaudiKernel/DeclareFactoryEntries.h"
+#include "TrkTrackCollectionMerger/TrackCollectionMerger.h"
+
+using namespace Trk;
+
+DECLARE_ALGORITHM_FACTORY( TrackCollectionMerger )
+
+DECLARE_FACTORY_ENTRIES( TrkTrackCollectionMerger )
+{
+ DECLARE_ALGORITHM( TrackCollectionMerger )
+}
+
diff --git a/Tracking/TrkAlgorithms/TrkTrackCollectionMerger/src/components/TrkTrackCollectionMerger_load.cxx b/Tracking/TrkAlgorithms/TrkTrackCollectionMerger/src/components/TrkTrackCollectionMerger_load.cxx
new file mode 100644
index 0000000000000000000000000000000000000000..fe7827ecc26a4e41730351ac3e8254b92a408d20
--- /dev/null
+++ b/Tracking/TrkAlgorithms/TrkTrackCollectionMerger/src/components/TrkTrackCollectionMerger_load.cxx
@@ -0,0 +1,4 @@
+#include "GaudiKernel/LoadFactoryEntries.h"
+
+LOAD_FACTORY_ENTRIES( TrkTrackCollectionMerger)
+