Thread: Drayton Park
View Single Post
  #16   Report Post  
Old February 16th 11, 01:59 AM posted to uk.transport.london
Clive Clive is offline
external usenet poster
  
First recorded activity at LondonBanter: Jul 2003
Posts: 523
Default Drayton Park
In message ,
writes
They cope only with difficulty. In DC electrified areas AC track circuits
tend to be used to avoid interference and in AC electrified areas they
tend to use DC track circuits. As you can see there is no third way to use
in dual-electrified areas. I don't know if similar considerations apply to
axle counters.
I understand what you say, but surely there is a frequency that can be
used that isn't a harmonic of either the 25kV or the ripple on the dc?
--
Clive

Reply With QuoteReply With Quote