From: joekor@earthlink.net   
      
   On 3/11/2016 4:02 PM, hounslow3@yahoo.co.uk wrote:   
   >> 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.   
      
   Because of careless train operators over 30 years ago, the TO must call   
   the command center to get permission to key by.  Most signals, with the   
   latest round of upgrading, the signal block begins a few feet in front   
   of the stop arm, so the train need only stop and proceed slowly to the   
   arm to lower.  There might be some that still need to have a button   
   pressed the make the arm lower.   
      
      
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