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Charing Cross (Northern line) tube crash
The Charing Cross (Northern line) tube crash occurred at 08:32 hours on 10 March 1938, when two Northern line trains collided near Charing Cross (now Embankment). Twelve people were slightly injured. The cause was a wrong-side failure of the automatic signals; an electrician had rewired a faulty signal, S94B, so that it showed green too soon after a preceding train had passed. Although the British Rail accident at Clapham Junction in 1988 bore resemblances to this very rare type of accident, there were significant differences. In fact the ramifications of this accident were to cause a major rethink of British Railway Signalling.
==Signal fault==
During the morning rush hour, the northbound departure signal at Waterloo station was operating intermittently, in that sometimes it turned green but sometimes it didn't, forcing the driver to proceed under the 'stop and proceed' rule applicable to underground working after a five-minute wait. The signal engineer for the area was unavailable and so an engineer was summoned from Kennington station. When he arrived, he gave instructions for the platform staff to hold the next train even if the signal turned green, while he entered the tunnel and looked for the fault.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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