Automatic door

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  1. A mine door operated by pressure of the locomotive wheels on a switch along the rails approaching the doors, which closes the door automatically after the trip has passed. These doors are preferable to regular mine doors. However, they must be carefully maintained to keep them in a safe operating condition.
  2. A wooden door arranged to close automatically when released, by installing the door with a slight lean in the direction of closing.
    Source: Dictionary of Mining, Mineral, and Related Terms

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