Muni has added sensors to train doors to detect if there is something or someone blocking the door.
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VIDEO: Woman dragged by San Francisco Muni train after getting hand caught in door
In April a woman was dragged after getting her hand caught in a closing door. A coupler failure had forced Muni to run new trains as single cars.
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There have been a total of three incidents since November of 2017 involving the back doors in which passengers were injured.
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