From what I've read from various sources inside Transit, all T/O (train operators) are trained for all equipment for their division, meaning T/Os on the lettered lines know how to operate all classes currently in service from the R32s to the R160s. (Though I believe there is special training for the R143s on Canarsie due to CBTC.) Same thing with the numbered lines.
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do you know how often the T/O's get trained