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the entry point to a restricted part of a network. The devices ensure that loads stacked on open or flat wagons stay within the height/shape limits of the line's bridges and tunnels, and prevent out-of-gauge rolling stock entering a stretch of line with a smaller loading gauge. Compliance with a loading gauge can be checked using a clearance car. In the past, they were simple wooden frames or physical feelers mounted on rolling stock. More recently, laser beams have been used.

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