On a busy afternoon at New York's Pennsylvania Station, passengers rush down the long corridor leading to the Amtrak waiting room, trailing bags and suitcases, and stopping to check the train schedules.

A middle-aged man wearing a beige windbreaker and black utility glasses parks a mountain of green bags in front of a kiosk that looks like an automated teller machine. He is oblivious to the baffling messages it flashes:

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