A small clip from a British Transport Film titled "The New Tradition" from 1968. The clip details a hot box detector installation near Tollerton. Before they used digital readouts and radio broadcasts to alert the train crews that there was a defect, they used a device in a signal box (tower) with a strip of paper and ink to graphically record where the defect was. When the employee saw the hotbox registered on the paper I would expect that they would change the next signal to red and stop the train and then have the crew call the signal box to ask why. Back in 1968 I don't believe BR had radios.
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