From: joekor@earthlink.net   
      
   On 8/29/2014 2:42 PM, Stephen Sprunk wrote:   
   > On 29-Aug-14 12:38, Joseph D. Korman wrote:   
   >> The train operator failed to get clarification about what was   
   >> obviously a confusing or incorrect order.   
   >   
   > Was this truly "obvious", or were strange orders common and the TO had   
   > learned not to question them?   
   >   
   >> The conductor failed to ask the T/O or the dispatcher for   
   >> clarification.   
   >   
   > So the second human made the same mistake as the first human?  I guess   
   > that shows the "benefit" of having two humans rather than one: twice the   
   > union dues for no actual improvement in safety.   
   >   
   > Computers aren't perfect, but they make _different_ mistakes than humans   
   > do, so they're more likely to catch each other.   
   >   
   >> As luck would have it, at least the T/O was operating at a slow   
   >> speed and had time to stop when she saw the southbound at W4th.   
   >   
   > If that line was unsignaled, wouldn't he have been limited to Restricted   
   > speed by rule?   
      
   The article said she was operating at restricted speed.   
      
   >   
   >> That southbound would not have had a stop and stay, as there are no   
   >> switches between 34th St and Canal on the express track.   
   >   
   > Wouldn't the southbound train have gotten a "Stop and Proceed"   
   > indication, which means moving at Restricted speed by rule?   
      
   There hasn't been a stop and proceed on the subway for decades.  The   
   key-by to lower automatic signal's stop arms require permission from the   
   command center.   
      
   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.   
      
   >   
   > This scenario is one of the reasons that Restricted speed means being   
   > able to stop within half of the sight distance: if two trains are moving   
   > toward each other at Restricted speed, they can stop in time to prevent   
   > a collision.   
   >   
   > S   
   >   
      
      
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