From: stephen@sprunk.org   
      
   On 16-Jan-16 22:01, hancock4@bbs.cpcn.com wrote:   
   > Stephen Sprunk wrote:   
   >> 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 wouldn't say a "century", since the electrification dates to the   
   > 1930s.   
      
   I said "around a century"; 80+ years is close enough.   
      
   > As to current load, the North Shore's Electroliners, using 600 V   
   > trolley poles, ran very fast,   
      
   That's 214,000 lbs for 106 seats, or 1.01 ton/seat, and a top speed of   
   90mph.   
      
   For reference, Acela is 1,246,000 lbs for 304 seats, or 2.05 ton/seat,   
   and has a top speed of (now) 160mph, which should requires over six   
   times as much power.   
      
   S   
      
   --   
   Stephen Sprunk         "God does not play dice."  --Albert Einstein   
   CCIE #3723         "God is an inveterate gambler, and He throws the   
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