From: dannyb@panix.com   
      
   In <9c1dfa88-f4bc-42c5-a225-1406f77d6ca4@googlegroups.com> hanco   
   k4@bbs.cpcn.com writes:   
      
   >On Monday, August 31, 2015 at 3:16:32 PM UTC-4, Stephen Sprunk wrote:   
   >> I can't think of how that'd relate to trains with electric traction.   
      
   >Very broadly, but the overall principal is the same--slower acceleration   
   >saves power. In old style DC power control systems, there was a control   
   >'logic' the regulated how much power was fed to the motors to accelerate   
   >the train. They used a combination of resistance and series/parallel   
   >connection of the motors. The economy mode optimized that combination   
   >to save on power.   
      
   Why would slower accelration save power? I could see it reducing   
   the peak demand, but the total power used to bring the train up   
   to speed should be the same whether you're feeding the motors   
   five hundred kilowatts or two thousand.   
      
   It'll just take longer...   
      
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