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Near London on the morning of December 12, 1988, the driver of the 7:18 train from Basingstoke to Waterloo saw a signal in front of him abruptly change from green to red. He stopped his train and called the signalman, who told him to proceed. Before he could, however, the 6:14 from Poole rammed into his train’s rear at about 40 mph (64 km/h). Then, an empty train traveling in the opposite direction hit the wreckage. The crashes killed 35 and injured hundreds more. What caused the signal failure? Discuss
Source: The Free Dictionary