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A manufacturer has recalled 54 bullet trains in China due to faulty sensors that cause them to stall. The trains have reportedly stalled 40 times since July, sometimes because a door was left ajar or someone smoked in the bathroom. The recall comes just a month after a deadly bullet-train crash killed 40 people and sparked widespread accusations that the trains had been developed too quickly. Authorities say the July crash occurred when lightning caused one train to stall and faulty sensors allowed a second train to keep moving on the same track and collide with it.