diff --git a/MuonSpectrometer/MuonValidation/MuonPRDTest/src/RPCDigitVariables.cxx b/MuonSpectrometer/MuonValidation/MuonPRDTest/src/RPCDigitVariables.cxx
index c1ce34f3be37337d359aeb6b0839d986411bcb3e..3e07bb98dce25b15eb85f10ff33416f7892b6552 100644
--- a/MuonSpectrometer/MuonValidation/MuonPRDTest/src/RPCDigitVariables.cxx
+++ b/MuonSpectrometer/MuonValidation/MuonPRDTest/src/RPCDigitVariables.cxx
@@ -34,6 +34,7 @@ StatusCode RpcDigitVariables::fillVariables(const MuonGM::MuonDetectorManager* M
       Identifier Id = digit->identify();
 
       std::string stName   = m_RpcIdHelper->stationNameString(m_RpcIdHelper->stationName(Id));
+      int stationIndex  = m_RpcIdHelper->stationName(Id);
       int stationEta       = m_RpcIdHelper->stationEta(Id);
       int stationPhi       = m_RpcIdHelper->stationPhi(Id);
       int doubletR          = m_RpcIdHelper->doubletR(Id);
@@ -42,33 +43,43 @@ StatusCode RpcDigitVariables::fillVariables(const MuonGM::MuonDetectorManager* M
       int gas_gap          = m_RpcIdHelper->gasGap(Id);
       bool measuresPhi     = m_RpcIdHelper->measuresPhi(Id);
       int strip            = m_RpcIdHelper->strip(Id);
-      int channel          = m_RpcIdHelper->channel(Id);
       
       ATH_MSG_DEBUG(     "RPC Digit Offline id:  Station Name [" << stName << " ]"
                          << " Station Eta ["  << stationEta      << "]"
                          << " Station Phi ["  << stationPhi      << "]"
                          << " GasGap ["       << gas_gap         << "]"
-                         << " Strip ["         << strip        << "]"
-                         << " ChNr ["         << channel         << "]");
+                         << " Strip ["         << strip        << "]");
       
       const MuonGM::RpcReadoutElement* rdoEl = MuonDetMgr->getRpcReadoutElement(Id);
       if (!rdoEl) return StatusCode::FAILURE;
+      
       int stripNumber = 0;
+      bool stripPosition = 0;
       Amg::Vector3D gpos(0.,0.,0.);
       Amg::Vector2D lpos(0.,0.);
-
-      rdoEl->stripPosition(Id,lpos);
-      rdoEl->surface(Id).globalToLocal(gpos, gpos, lpos);
-
+      double localX;
+      double localY;
+      
+      if ( !rdoEl->stripPosition(Id,lpos) ) {
+            ATH_MSG_WARNING("RPCDigitVariables: failed to associate a valid local position for strip n. " << strip
+                         << "; associated positions will be set to 0.0.");
+          } else {
+            localX = lpos.x();
+            localY = lpos.y();
+          }
+      
+      rdoEl->surface(Id).localToGlobal(lpos, gpos, gpos);
+      stripNumber = rdoEl->stripNumber(lpos,Id);
+      stripPosition = rdoEl->stripPosition(Id,lpos);
+      
       m_RPC_dig_globalPosX.push_back( gpos.x() );
       m_RPC_dig_globalPosY.push_back( gpos.y() );
       m_RPC_dig_globalPosZ.push_back( gpos.z() );
-      m_RPC_dig_localPosX.push_back( lpos.x() );
-      m_RPC_dig_localPosY.push_back( lpos.y() );
-     
-      stripNumber  = rdoEl->stripNumber(lpos,Id);
-
+      m_RPC_dig_localPosX.push_back(localX);
+      m_RPC_dig_localPosY.push_back(localY);
+      
       m_RPC_dig_stationName.push_back(stName);
+      m_RPC_dig_stationIndex.push_back(stationIndex);
       m_RPC_dig_time.push_back(digit->time());
       m_RPC_dig_stationEta.push_back(stationEta);
       m_RPC_dig_stationPhi.push_back(stationPhi);
@@ -78,7 +89,7 @@ StatusCode RpcDigitVariables::fillVariables(const MuonGM::MuonDetectorManager* M
       m_RPC_dig_doubletPhi.push_back(doubletPhi);
       m_RPC_dig_strip.push_back(strip); 
       m_RPC_dig_stripNumber.push_back(stripNumber);  
-      m_RPC_dig_channel.push_back(channel);   
+      m_RPC_dig_stripPosition.push_back(stripPosition);
       m_RPC_dig_measuresPhi.push_back(measuresPhi);
       
       m_RPC_nDigits++;
@@ -95,6 +106,7 @@ StatusCode RpcDigitVariables::clearVariables()
   m_RPC_nDigits = 0;
   m_RPC_dig_time.clear();
   m_RPC_dig_stationName.clear();
+  m_RPC_dig_stationIndex.clear();
   m_RPC_dig_stationEta.clear();
   m_RPC_dig_stationPhi.clear();
   m_RPC_dig_gas_gap.clear();
@@ -102,8 +114,8 @@ StatusCode RpcDigitVariables::clearVariables()
   m_RPC_dig_doubletZ.clear();
   m_RPC_dig_doubletPhi.clear();
   m_RPC_dig_strip.clear();   
-  m_RPC_dig_channel.clear(); 
   m_RPC_dig_stripNumber.clear();     
+  m_RPC_dig_stripPosition.clear();  
   m_RPC_dig_measuresPhi.clear();  
 
   m_RPC_dig_localPosX.clear();
@@ -124,6 +136,7 @@ StatusCode RpcDigitVariables::initializeVariables()
     m_tree->Branch("Digits_RPC",              &m_RPC_nDigits, "Digits_RPC_n/i");
     m_tree->Branch("Digits_RPC_time", &m_RPC_dig_time); 
     m_tree->Branch("Digits_RPC_stationName", &m_RPC_dig_stationName);
+    m_tree->Branch("Digits_RPC_stationIndex", &m_RPC_dig_stationIndex);
     m_tree->Branch("Digits_RPC_stationEta",  &m_RPC_dig_stationEta);
     m_tree->Branch("Digits_RPC_stationPhi",  &m_RPC_dig_stationPhi);
     m_tree->Branch("Digits_RPC_gas_gap",     &m_RPC_dig_gas_gap);
@@ -131,8 +144,8 @@ StatusCode RpcDigitVariables::initializeVariables()
     m_tree->Branch("Digits_RPC_doubletZ",     &m_RPC_dig_doubletZ);
     m_tree->Branch("Digits_RPC_doubletPhi",     &m_RPC_dig_doubletPhi);
     m_tree->Branch("Digits_RPC_strip",  &m_RPC_dig_strip);
-    m_tree->Branch("Digits_RPC_channel",  &m_RPC_dig_channel);
     m_tree->Branch("Digits_RPC_stripNumber",  &m_RPC_dig_stripNumber);
+    m_tree->Branch("Digits_RPC_stripPosition",  &m_RPC_dig_stripPosition);
     m_tree->Branch("Digits_RPC_measuresPhi",  &m_RPC_dig_measuresPhi);
     
     m_tree->Branch("Digits_RPC_localPosX", &m_RPC_dig_localPosX);
diff --git a/MuonSpectrometer/MuonValidation/MuonPRDTest/src/RPCDigitVariables.h b/MuonSpectrometer/MuonValidation/MuonPRDTest/src/RPCDigitVariables.h
index 3fa6879332ef478e8d3054d56807939a79392f5e..09215c913767e4dd1a0fe55a5378347a8dba3ac9 100644
--- a/MuonSpectrometer/MuonValidation/MuonPRDTest/src/RPCDigitVariables.h
+++ b/MuonSpectrometer/MuonValidation/MuonPRDTest/src/RPCDigitVariables.h
@@ -45,6 +45,7 @@ class RpcDigitVariables : public ValAlgVariables
 
   int m_RPC_nDigits;
   std::vector<std::string> m_RPC_dig_stationName;
+  std::vector<int> m_RPC_dig_stationIndex; // stationIndex = 1 for BIS
   std::vector<double> m_RPC_dig_time;
   std::vector<int> m_RPC_dig_stationEta;
   std::vector<int> m_RPC_dig_stationPhi;
@@ -53,8 +54,8 @@ class RpcDigitVariables : public ValAlgVariables
   std::vector<int> m_RPC_dig_doubletZ;
   std::vector<int> m_RPC_dig_doubletPhi;
   std::vector<int> m_RPC_dig_strip; 
-  std::vector<int> m_RPC_dig_channel;
   std::vector<int> m_RPC_dig_stripNumber;
+  std::vector<bool> m_RPC_dig_stripPosition;
   std::vector<bool> m_RPC_dig_measuresPhi;
   
   std::vector< double > m_RPC_dig_localPosX;