High Quality Content by WIKIPEDIA articles! Rule 55 was an operating rule adopted by railway companies in the British Isles in the late 19th century. It was introduced following a spate of accidents caused by signalmen forgetting that trains were standing on the line, sometimes within sight of their signal boxes. The rule required that, if a train was brought to a stand at a signal, within three minutes in clear weather or immediately in rain, snow or fog, the driver of the train must despatch his fireman, guard or any shunter riding on the train, to the signal box to ensure that the signalman was aware of the presence of the train, and that all safeguards to protect the train, such as slides or collars on the signal levers, were in place, the crewman then signing the train register to confirm this.

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