Service With The Southeastern Pennsylvania Transportation Authority During Car Shortage [Getty Images]

Traffic stands next to a Southeastern Pennsylvania Transportation Authority (SEPTA) subway car on the Market-Frankford line in Philadelphia, Pennsylvania, U.S., on Tuesday, Feb. 07, 2017. SEPTA officials announced that they removed dozens of transit cars out of service due to a crack found on a main load-carrying beam of a car on the Market-Frankford line and expect a shortage of transit cars to continue at peak hours. Photographer: Charles Mostoller/Bloomberg via Getty Images

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