If I'm remembering correctly, it's literally a schedule. They give you a minute-precision schedule on an electronic sign: http://images.freeimages.com/images/pr

If I'm remembering correctly, it's literally a schedule. They give you a minute-precision schedule on an electronic sign: http://images.freeimages.com/images/previews/c5b/jr-train-station-1513478.jpg http://images.freeimages.com/images/previews/c5b/jr-train-st... In normal situations, the arrival time doesn't change, and the train pulls in within seconds of the right time. It is startlingly precise (to someone used to American transit), even during high traffic times in the middle of Tokyo.