From: denismfmcmahon@gmail.com   
      
   On Wed, 20 May 2015 16:54:42 -0400, Jishnu Mukerji wrote:   
      
   > On 5/17/2015 9:56 AM, Denis McMahon wrote:   
   >> On Sun, 17 May 2015 09:49:15 -0400, Jishnu Mukerji wrote:   
   >>>   
   >>> 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.   
      
   > I don't think anyone has suggested that tilt would make it possible to   
   > take that curve at 100mph. The speed limit for Class A trains on that   
   > curve is 60mph, that is 10mph faster than Class B trains.   
      
   Hence my confusion at the bit of your earlier comment that you snipped:   
      
   "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."   
      
   and seeking clarification as to whether we were still discussing the   
   derailment curve.   
      
   --   
   Denis McMahon, denismfmcmahon@gmail.com   
      
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