From: wb8foz@panix.com   
      
   "hounslow3@yahoo.co.uk"  writes:   
      
   >On 14.12.16 22:34, hancock4@bbs.cpcn.com wrote:   
   >> http://www.nytimes.com/2016/12/13/nyregion/second-ave-subway-   
   ndrew-cuomo.html   
   >>   
      
   >What's a shunt trip breaker, BTW?   
      
   A circuit breaker opens when there's an overload, or when   
   someone moves the handle.   
      
   A shunt-trip breaker has an added solenoid that can emulate   
   the hand on the handle; it's run by some other remote control   
   system.   
      
   Within WMATA, the control center can kill the third rail power   
   on any part of a line by remotely energizing said solenoid. I   
   assume NYCTA is similar.   
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