On 27.08.15 16:35, Stephen Sprunk wrote:   
   > On 26-Aug-15 03:40, srfurley@googlemail.com wrote:   
   >> Isn't the 25 Hz. on the ex PRR lines provided via solid state   
   >> frequency converters now?   
   >   
   > There are two static inverters and one static cycloconverter now, but   
   > five motor-generator sets (at three sites) remain:   
   >   
   > https://en.wikipedia.org/wiki/Amtrak%27s_25_Hz_traction_power_system   
   >   
   > S   
   >   
   The talk about power supply has reminded me of something else.   
      
   I notice that all trains on the New York City Subway all the way up to   
   the R-68A have what is called Encon Control: This is normally a toggle   
   switch on the console or just below it, depending on the model, for   
   either local or express service.   
      
   One TO told me a while back that he sets it, depending where his train   
   is on the line. He noted that there was not much difference between the   
   two settings, except that pick-up speeds were slightly higher when the   
   switch was on express.   
      
   How exactly does the Encon control work, however? Did it route the power   
   through either one more or less set of resistors, depending on the   
   switch setting?   
      
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