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1.
To position oneself on a subway platform such that, when the passenger steps off the train at his destination, he'll be as close as possible to the exit or stairs to his transfer. Used and done often in the nyc subway system.
Sorry, I can't talk with you while we wait for the train. I've got to prewalk to the end of the platform.

I save time prewalking.
by OfEternity October 30, 2005