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(e.g football beer mat)
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Smallest Railway Chock - Current world record
1. The smallest working railway chock for a model railway is 4.15 mm long and 0.92 mm wide. It weighs 0.005 gram. It has been constructed by Heinz O. Schramm (Germany). The miniature chock has been demonstrated with a Z scale model railway on 17 April 2016 in Altenbeken, Germany.

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