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| Re: Fourth Rails and Safety (832302) | |||
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Re: Fourth Rails and Safety |
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Posted by SelkirkTMO on Sat Sep 12 01:54:22 2009, in response to Re: Fourth Rails and Safety, posted by Bill West on Fri Sep 11 21:53:29 2009. Just wanted to make a point as an electrical engineer about (2b) back there. For the voltages to be a negative ~200 and a positive ~400, there has to be a common (ground) reference in order to split those voltages between the two power rails as such. And as electric railroads discovered much to their dismay in the early 20th century, that common traction power return path can either be through the rails themselves or through stray paths which is what caused all the concern about the electrolysis issues way back when ... just a thought. :) |
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