Do subway trains in NYC stop at the exact same spot every time? That's what impresses me so much about the trains in Hong Kong - if they go a few feet too far, the openings to the train wouldn't match up with the openings to the wall, and no one could get on. Without permanent markers, I can't tell whether other trains are that precise. If so, it would be easy to put up barriers with gates in subway systems that only use one type of train, but that wouldn't work otherwise.
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