From: wb8foz@panix.com   
      
   srfurley@googlemail.com writes:   
      
   >If I remember correctly the last 25 Hz. rotary converters on the Subway were   
   shut down in 1999, with some 60 Hz. ones lasting slightly longer.   
      
   >Isn't the 25 Hz. on the ex PRR lines provided via solid state frequency   
   converters now?   
      
   Yes and no. The solid state inverters are reliable and   
   efficient, but generate lots of nasty harmonics. The rotary   
   converters do not and they swallow the harmonics the others   
   create.   
      
   So Jericho Park is solid state, but north of there are rotary ones.   
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