XPost: alt.folklore.computers   
   From: dannyb@panix.com   
      
   - adding nyc.transit to the mix. I'm surprised that Hancock   
   hasn't already done so as he's a frequent poster there.   
      
   In  Stephen Sprunk  writes:   
      
   >I'd be surprised if they were still using 25Hz power; the only real   
   >source of that these days is Amtrak's network, which doesn't exactly   
   >have the spare capacity to run NYC's entire subway.  It's reasonably   
   >safe to assume they're using 60Hz input.   
      
   Back in the 1970s I saw that the subway station lighting   
   for the 8th Ave station (in the Penn Station footprint)   
   was 25 CPS. So it's _possible_ that the NYCT substation   
   powering the third rail in that zone was fed by 25 CPS   
   as well, but highly unlikely.   
      
   >However, I haven't seen anything that indicates whether NYCT has moved   
   >entirely to solid-state rectifiers or still uses motor-generators; the   
   >latter can just as easily use 60Hz as 25Hz input.  I suspect they use   
   >some combination of MG and SS, with the former being replaced by the   
   >latter as they inevitably fail.   
      
   The rotary converters have been toast for years.   
      
   --   
   _____________________________________________________   
   Knowledge may be power, but communications is the key   
   		     dannyb@panix.com   
   [to foil spammers, my address has been double rot-13 encoded]   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)