On Wednesday, November 2, 2016 at 11:47:44 PM UTC-4, John Albert wrote:   
   > Cab signals and speed control (until the Metro-North   
   > accident) applied ONLY to signal indications (i.e., would   
   > apply brakes if engineman did not take appropriate action   
   > after passing a more restrictive signal indication).   
   >   
   > After the Spyten Duyvil wreck, Metro-North installed cab   
   > signal "drops" approaching certain speed restrictions. These   
   > operate independently of signal indications.   
      
   However, it sounds to be relatively trivial to install a slower   
   signal at a serious speed restriction to force a slowdown, as   
   MetroNorth did.  Simply change the most permissive aspect on   
   a signal from proceed to a slower speed.   
      
   It also seems rather simple to add on more aspects than the 1951   
   technology; I think its fastest was 45 mph for approach limited.   
      
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