043286EE   
   From: joekor@earthlink.net   
      
   On 9/1/2014 9:06 AM, Calvin Henry-Cotnam wrote:   
   > Joseph D. Korman (joekor@earthlink.net) said...   
   >>   
   >> I'll preface this with the fact that there is no reverse signaling on   
   >> that part of the IND.   
   >   
   > That partly explains things.   
   >   
   > I am not aware of the details of NYC's subway signalling system, but I   
   > am with Toronto's, which was modelled after NYC's. I was making some   
   > assumptions that may be incorrect as Toronto's may vary from NYC's more   
   > than I had thought.   
   >   
   > Most of Toronto's system has no reverse signalling. Where turnback   
   > crossovers exist that would move a train to a "wrong way" movement on   
   > a track, the signals are only bi-directional for one block. At the far   
   > end of that block, the wrong-way direction has a signal that can only   
   > display red-over-red (they actually have no other lamps and lenses).   
   > There may be a call-on or key-by process to pass the signal, but this   
   > would require such an out-of-the-ordinary process involving transit   
   > control that the crew on the train could not simply keep going without   
   > any other instructions.   
   >   
   > I find it difficult to believe that without reverse signalling on a line,   
   > that there is not a final red-only signal where a turnback movement can   
   > be done to prevent this sort of thing from happening. If this is the case,   
   > this is a very MAJOR design flaw.   
   >   
      
   Interesting point, but that would require a stop and stay signal at the   
   "wrong" end of every station.   
      
   Copied from another post from me in this thread:   
      
   BTW, that SB train at West 4th would have seen the automatic signal at   
   the leaving end of the station go from green to yellow, to red with the   
   stop arm up, then red with the stop arm down, the the errant train might   
   be visible by then.   
      
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