Rotary Converter, IRT Subway Substation 13, Midtown Manhattan, 2017.
All the pixels, no Metrocard required, at https://www.flickr.com/photos/mattblaze/32992380451
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this post was submitted on 19 Apr 2025
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NYC's IRT subway, opened in 1904, is powered by a 600 volt DC third rail running alongside the tracks. Power is fed to the system via a number of substations throughout the city, where high voltage AC is converted to the lower voltage DC used by trains.
Until recently, this was done with electromechanical rotary converters (essentially a combination AC motor and DC generator). They are now supplanted by solid state rectifiers, but a few of the original rotary converters remain operational.
@mattblaze@federate.social haha I came to this thread thinking "didn't they use mercury arc rectifiers, like DC elevators and such?" and learned that they didn't!
So thanks for that. ๐