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union pacific cab codes
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Dear Wisser, <br /> <br /> I had read once that 60Hz was used as a code AC frequency for the rails, except, in areas where a power company's transmission lines would cause interfernce. Then, 100Hz would be used. I understand way up north, our 25Hz traction currents to power our electrifieds would cause interference, so, they used 91 and two thirds Hz (or, something strange like that). 100Hz was chosed for the PRR's signal system power so that the 25Hz wouldn't influence it and cause things like false clear signals, etc. But, in some places, the 25Hz did interfere with the 100Hz, so, they tried an odd AC freq. like 91 2/3Hz. This has to do with harmonics (i.e. 25Hz, 50Hz, 100Hz). I was once told that the UPRR used a coded DC cab signal system. I didn't think that was true, because of the high losses of DC over distances. Tom Edison was a supporter of DC energy, but, George Westinghouse won with his push for AC energy (though the AC generator was invented by Tesla, but, George had the $$$ while Tesla, though being a genius, was earning $2 per day digging sewers!). <---- Got that from the History Channel the other night! Anyways, back to the UPRR and Sante Fe, I'm still waiting to hear from someone who knows just exactly those 2 railroads were using!
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