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A shaft rolleywayman at Lambton "D" Colliery, Durham, was standing on the flatsheets on the south side of the shaft when a main and tail rope set of 40 full tubs ran amain into the north side shaft siding. The rolleywayman in attempting to pass the shaft to reach a telephone cabin nearby was caught by the runaway tubs and instantly killed. The set broke away on a drift dipping outbye four and a half inches per yard when an offtakes socket further inbye was drawn due to the point catching a check table batten, completely shearing all four rivets with which the socket was secured to the rope. There was insufficient time to use the drop baulk runaway stop provided, but it was subsequently altered so that it could be quickly and safely operated by a lever placed near the shaft, and could be lowered into position when the set was approaching the shaft and remain closed until the set came to rest in the shaft siding. Solid sockets were introduced.
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