Transportation deposits energy?

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Hi,

While examining the output of some code, I noticed that a "Transportation" process is depositing energy in my sensitive detector which seemed a little strange to me. I then modified examples/novice/N02 where I define the stepping action to be:

 void ExN02SteppingAction::UserSteppingAction(const G4Step* aStep)
 {
   G4String process = aStep->GetPostStepPoint()->GetProcessDefinedStep()
                           ->GetProcessName();
   if(process == "Transportation"){
   G4cout << "In transport step action, energy dep = "
          << "\t" << aStep->GetTotalEnergyDeposit() << G4endl;
   }
 }

and then run the run1.mac macro with no other changes. Here is a snippet of the output:

 ### Run 1 start.
 Start Run processing.
 In transport step action, energy dep =  0.022127794
 In transport step action, energy dep =  9.6219292
 In transport step action, energy dep =  0.014266496
 In transport step action, energy dep =  0.090739375
 In transport step action, energy dep =  0.0048101879
 In transport step action, energy dep =  0.10046924
 In transport step action, energy dep =  0.0018481132
 In transport step action, energy dep =  0.11301416
 In transport step action, energy dep =  0.040421597
 In transport step action, energy dep =  0.11809491
 In transport step action, energy dep =  0.0043232425
 In transport step action, energy dep =  0.040039835
 In transport step action, energy dep =  0.092960496
 In transport step action, energy dep =  0.034912215
 In transport step action, energy dep =  0.11443206
 In transport step action, energy dep =  0
 In transport step action, energy dep =  0.016303982
 >>> Event 0

This has been seen in both Geant4 6.2.p01 and 7.1. Can someone help me understand what is going on?

Thanks, Scott.