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AFAIK, there's no NYC subway substations nearby. There is a subway line on Broadway, and running currents can easily exceed 10,000 amps, and acring can throw off enough noise to screw up even FM radios (something I experienced in Lynbrook on an icy day one winter when an LIRR train pulled out of the Lynbrook station...)
Given how sensitive the old IO cameras were to anything, including probably the phase of the moon, it wouldn't surprise me if regular subway ops were an issue.
Legend has it that the PRR's commuter trains screwed with Philcos's testing in the 30's...
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