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Originally Posted by sav858
I haven't read anything about BART being able to increase capacity with an additional door. I get what you're saying but I'm just not convinced a shorter dwell times of a maybe a few seconds is really going to add up to allowing BART to run more trains. I could be wrong but I feel like BART would be advertising that if it was the case.
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BART wanted and got six exits/entrances in each new car to shorten dwell times. Shorter dwell times mean more trains can serve a given station in a given hour. More trains per hour can carry more passengers.
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I think the only thing that would allow them to run more trains is a new/upgraded train control system, as you said. Currently they run 24 trains per hour during the peak.
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An upgraded control system is another piece of the puzzle, as are additional exits from the platforms at Embarcadero and Montgomery to reduce crowding that slows boarding/deboarding and thus increases dwell times.