From: joekor@earthlink.net   
      
   On 3/10/2016 9:23 PM, hancock4@bbs.cpcn.com wrote:   
   > 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?   
   >   
   >   
      
   A clarification of the Transit Call-On (at least in NYC):   
      
   Not only does the tower have to activate the white light (R/R/W), the   
   train operator must push a button or lever on the signal head to lower   
   the stop arm.  If the tower hadn't activated it, the button/lever will   
   not work for the T/O.   
      
      
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