From: denismfmcmahon@gmail.com   
      
   On Sun, 17 May 2015 09:49:15 -0400, Jishnu Mukerji wrote:   
      
   > Those speed limits apply to so called Class B trains like the Amtrak   
   > Northeast Regionals and Acelas with tilt mechanism disabled. Class A   
   > trains (Acelas with tilt enabled) are allowed to go through that curve   
   > at 100mph.   
      
   > With the complete operationalization of ACSES all these civil speed   
   > limits will appear on the ADU in the cab, and the specific speed limit   
   > applies to that class of train is the one that will appear. There are   
   > five different classes of trains on the NEC which have different speed   
   > limits that apply to them.   
      
   Are we still talking about the curve where the derailment happened?   
      
   Tilt doesn't change the speed at which it's safe to take a curve, tilt   
   just makes it less uncomfortable for the passengers at higher speeds.   
      
   I doubt very much that anything would have been able to take that curve   
   at 100 mph just by enabling tilt - it's (reportedly) 2900 feet radius and   
   5 inches of superelevation.   
      
   --   
   Denis McMahon, denismfmcmahon@gmail.com   
      
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