I can't even begin to imagine why they do that. However, if indeed that is the case, then the delay is being caused by a lazy conductor. There is simply no reason that he/she couldn't have crossed over to the next car prior to arriving into that station. Then they'd be ready to open the doors immediately upon arrival and the other cab would be free for the conductor taking over.Not sure, but my lines (they use the R160 cars) always take around 5 - 10 seconds to open the doors from the time the train stops. Watching from the outside of the train, I see the train come to a halt, the conductor exits his position, crosses over to the next car, inserts his key, and then the doors open.
Maybe it doesn't happen on the (7) because of the necessary low layover time.
And a shorter layover time would be a bigger reason to occupy a different cab upon arrival. Every other line, save the L, simply doesn't have the frequencies that would demand such a quick turnover.
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