From: stephen@sprunk.org   
      
   On 15-Feb-16 07:50, Clark F Morris wrote:   
   > Charles Ellson  wrote:   
   >> kh@pnnnnx.kom (Kurt Hackenberg) wrote:   
   >>> Stephen Sprunk   wrote:   
   >>>> This is why all new high-speed lines are 2x25kV.   
   >>>   
   >>> What does 2x mean?   
   >>>   
   >> https://en.wikipedia.org/wiki/25_kV_AC_railway_electrification -> 2   
   >> × 25 kV autotransformer system   
   >>   
   >> https://www.railelectrica.com/traction-distribution/2x25-kv-traction-system/   
   >   
   > Can as much power be transmitted from the grid to the locomotives /   
   > EMUs at 12.5 KV as is delivered at 25 KV at a given frequency?   
      
   As written, yes, but it requires twice the current, which means even   
   more power pulled from the grid but lost to resistance rather than   
   delivered to the trains.  That's not good.   
      
   If you actually meant 2x12.5kV and/or 2x25kV, that ratio may change.   
      
   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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