So, I see a train stopped at a red over red signal, a home signal at an   
   interlocking (no number plate).  The train sat there for a few minutes,   
   then slowly moved ahead (presumably at restricted speed).  There was   
   a railroad work truck at the switch.   
      
   Presumably the train had authority to do so.   
      
   Anyway, what does it take for a train to move against a red signal?   
   Is a radio transmission from the dispatcher enough?   
      
   In rapid transit, interlocking signals have a "call-on" indicator,   
   which is a light set by the towerman, granting authority for a   
   train to move, at restricted speed, against an otherwise red signal.   
   Do regular railroads have such a feature?   
      
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