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Can anyone advise me of what kind of cab code sysytem the UPRR uses? On the northeast corridor, we code 100Hz AC energy onto the rails (and 250Hz in some limited locations). We are presently using the 75, 120, and 180 pulses per minute rates. I had read some railroads have used 60Hz, but, would have to use 100Hz in areas where interference was caused by a power company's high voltage transmission lines. I had also heard that the Sante Fe had also used a cab code system, but, I'm not sure if they still do. Any info would be greatly appreciated! Please e-mail directly, if you wish (in case of a lengthly reply - which still would be greatly aprreciated!) [:)]
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