养路工trackman;machine operator;track machanics 巡道工track walker;track patrolling man 道口看守工grade crossing watchman;level crossing watchman ..
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The 44-tonne Metcalfe's truck from Hawes in North Yorkshire was spotted by a dog walker as it drove about 300m (985ft) along the concrete track.
BBC: Lorry on Cambridgeshire guided busway
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