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| Re: MTA Metro-North Railroad Penn Station Access - The new station locations and track maps/diagrams (1576577) | |||
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Re: MTA Metro-North Railroad Penn Station Access - The new station locations and track maps/diagrams |
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Posted by Bill West on Mon May 24 14:44:42 2021, in response to Re: MTA Metro-North Railroad Penn Station Access - The new station locations and track maps/diagrams, posted by nasadowsk on Mon May 24 13:07:51 2021. "Potential transformers" -exactly my thought. Current transformers and the lighting arrestor's ability to carry an arc for 1/2 of the longer 25 HZ cycle too.That DC float/offset in NYP creates a 4th harmonic of the 25 Hz. That's why PRR had to go from 100 Hz to 91 2/3 Hz for the cab signals. Only a few branches of electrical engineering would be up on the Fourier analysis needed to sort the problem. Bill |
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