Charing Cross tube crash

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The Charing Cross tube crash occurred on 17 May 1938, when two District Line trains collided near Charing Cross (now Embankment). Six people were killed. The cause was a wrong-side failure of the automatic signals; an electrician had rewired a faulty signal incorrectly, so that it showed green too soon after a preceding train had passed. This very rare type of accident also occurred on British Rail at Clapham Junction in 1987.