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How do railroads keep track of where their rail cars are?

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In the early days of freight rail, there was only one way to keep track of freight cars: the old-fashioned way, with the paper forms for every car physically passed from hand to hand as the train entered each new railyard. read more

In terms of position where they actually are on the track, this is done via track circuits that work via passing a small current through the rails, which train wheels will short-circuit. read more

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