043286EE   
   From: calvin@remove.daxack.ca   
      
   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.   
      
   --   
   Calvin Henry-Cotnam   
   "Unusual or extreme reactions to events caused by negligence   
    are imaginable, but not reasonably foreseeable"   
     - Chief Justice Beverley McLachlin, May 2008   
      
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