In Reply to: What is it? posted by jea48 on November 14, 2017 at 20:11:13:
I just revisited this:
IF you can demonstrate subway connection? I'd say it was commutator noise. That is the sliding contact from the 3rd rail to the subway power system.
Cure if this is demonstratated is another matter altogether.
Too much is never enough
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Follow Ups
- RE: What is it? - pictureguy 20:21:09 12/07/18 (0)