From: denismfmcmahon@gmail.com   
      
   On Fri, 22 May 2015 08:17:39 -0400, Jishnu Mukerji wrote:   
      
   >> and seeking clarification as to whether we were still discussing the   
   >> derailment curve.   
      
   > That was an error. My bad. Sorry. It should have said 60mph. They are   
   > allowed to go a little faster.   
      
   No problem, we have a hobbyist wants-to-be high speed line designer in   
   the UK group who thinks everything can be speeded up by tilt - he just   
   doesn't seem capable of comprehending that no amount of tilt between the   
   carriage body and the bogey is going to change the laws of physics at the   
   wheel / rail interface.   
      
   Nor is he capable of understanding that you can't simply keep increasing   
   the superelevation instead, because he doesn't get the flange riding the   
   inside at low speeds problem if a train ever needs to stop on such a   
   curve. Most of us know that as soon as you raise the superelevation on a   
   curve to a point where a train needs to maintain a minimum speed to avoid   
   derailing by flange climbing on the inner rail, there's going to be a   
   train that goes round that curve too slow and derails.   
      
   --   
   Denis McMahon, denismfmcmahon@gmail.com   
      
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