From: jishnu@nospam.verizon.net   
      
   On 5/22/2015 3:45 PM, Denis McMahon wrote:   
   > 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.   
      
   I will be out in Berlin Germany in two weeks and made it a point to get   
   a German Railpass to get some ICE train riding under my belt. In   
   particular I will be riding the Berlin to Munich service which use the   
   tilting ICE-T sets. DB claims that they can schedule them to save about   
   20mins per hour compared to non-tilting trains on the twisting track   
   profile that is found on the Berlin - Munich route. it should be fun to   
   see how it feels. And of course the Germans also have the additional   
   advantage of both allowing more banking and greater underbalance for   
   high speed operations than are allowed in the US.   
      
   But yes, at the end of the day the forces at the wheel rail interface   
   have to remain within limits of safety tilt or no tilt.   
      
   The other one I will try is the Berlin - Frankfurt Sprinter service   
   which is basically a non-stop hourly service with a 4 hour and a few   
   minutes running time from start to stop, with upgraded food service and   
   such - a very businessman oriented train. I am almost certain that it   
   will be more impressive than anything we have on this side of the pond.   
   But we'll see.   
      
   --- SoupGate/W32 v1.03   
    * Origin: LiveWire BBS -=*=- UseNet FTN Gateway (1:2320/1)