On 11.03.16 17:09, Joseph D. Korman wrote:   
   > 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.   
   >   
   >   
   What about a key-by? You can still do that with the fixed-block signals   
   on the Subway.   
      
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