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| Re: Fourth Rails and Safety (832203) | |||
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Re: Fourth Rails and Safety |
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Posted by SelkirkTMO on Fri Sep 11 19:41:33 2009, in response to Re: Fourth Rails and Safety, posted by MGL on Fri Sep 11 19:30:45 2009. Protection of the tunnels from electrolysis. I don't recall the exact voltages, it's somewhere around 700 volts and one rail does negative 350 and the other one does positive 350 with the rails at earth ground as normal. Prevents corrosion of the iron tunnel structures ... |
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