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Original Text (Annotation: EAW031728 / 1104421)
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Fogman's hut. In foggy weather this would be manned by a platelayer who would fasten on one rail a detonator if the adjacent signal showed caution. He would remove it if possible if the signal went to clear. The detonator would "explode" with a loud bang and warn the driver of his passing of a caution signal. They were not used at stop signals. '