Why doesn't the just skip 138th street-grand concourse on the local track? As the current setup, it just delays trains. The amount of timers on that small switchover, the constantly brakes and accelerates on the express track to get through that section. The could just run-thru with the right behind it. It delays both trains because as a pulls in, and the inches by and the has to hold in the station. Thus, effectively slowing down the speed of both trains.
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