From: stephen@sprunk.org   
      
   On 15-Jan-16 18:18, Clark F Morris wrote:   
   > Stephen Sprunk  wrote:   
   >> On 14-Jan-16 17:10, Clark F Morris wrote:   
   >>> Except as I understand it, 12.5 KV won't give enough power to   
   >>> support 100+ mile an hour operation.  Note the relatively slow   
   >>> speeds on the Metro-North New Haven line.   
   >>   
   >> Amtrak (and its predecessors) have been doing up to 135mph on 11kV   
   >> 25Hz lines for around a century; the main reason they couldn't go   
   >> faster was the variable-tension catenary.  That's roughly twice as   
   >> much current as 200mph on 2x25kV lines in France and China, so I'm   
   >> not sure current is really a limiting factor.   
   >   
   > I should have been more clear.  I meant 12.5 KV at 60 cycles.  I   
   > seem to recall the problem has to do with back EMF but my memory is   
   > vague.   
      
   Does frequency matter when it's just going straight into a rectifier?   
      
   I scanned ,   
   but I'm not seeing anything that seems relevant.   
      
   S   
      
   --   
   Stephen Sprunk         "God does not play dice."  --Albert Einstein   
   CCIE #3723         "God is an inveterate gambler, and He throws the   
   K5SSS        dice at every possible opportunity." --Stephen Hawking   
      
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