From: stephen@sprunk.org   
      
   On 17-May-15 06:56, Denis McMahon wrote:   
   > 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.   
      
   Tilting doesn't affect risk of derailment, but the FRA's speed limits   
   are not based on that; they're based on passenger comfort, so higher   
   speeds are allowed for tilting trains than non-tilting ones.  That's why   
   Acela is a tilting design in the first place.   
      
   S   
      
   --   
   Stephen Sprunk         "God does not play dice."  --Albert Einstein   
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