Submitted by riski_click t3_115muwl in boston
what_comes_after_q t1_j94bbqb wrote
Reply to comment by Trpdoc in Man dies after touching 3rd rail at MBTA's Downtown Crossing station by riski_click
Trains travel on two rails, this is what you think of as a railroad track. Subways can have a third rail. This is not for steering the train, but for carrying electricity.
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