The shortest train line in New York City, probably the world. It runs in between Times Square and Grand Central and back all day, yes those are the only two stops.

Nobody knows why it exists, except for really lazy nut jobs who are to lazy to have one extra stop on the 7 train in between. Or if your in a rush to work where you need every second or your boss fires you, and this train buys you a little time.
Guy: I'm gonna take the 7 train to work today, it's the easiest way to work. No transfers, just a smooth ride.

Boss: (calls) If your one second late, your fired!!!

Guy: God damn, I only have 20 minutes left, Ugggg I guess i'm gonna take the useless 42nd Street Shuttle. Now I've gotta take the 7 train get off one stop at Times Square, transfer to the Shuttle, go to Grand Central, then walk back to the 7 train, and it buys me 1 minute. Worth it I guess?
by JJthedicktionare April 7, 2021
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