At 08.19 on 8 October 1952 three trains collided with one another at Harrow and Wealdstone Train Station, some 11 miles to the north of Euston Station in London. One of the trains was a local passenger service taking early morning commuters from Tring to Euston, and the other was a passenger service from Perth to Euston. A third train, the 08.00 express travelling from Euston to Liverpool and Manchester ploughed into the wreckage created by the initial collision of the trains travelling from Perth and Tring.
A combination of poor weather (patchy fog), misread signals and inadequate equipment led to a disaster that was only exceeded in scale by the disaster at Gretna Green in 1915, when 227 persons, mostly soldiers heading to the Front, were killed. The carnage of Harrow and Wealdstone can be comprehended if one considers the effects of a crowded passenger train (the Liverpool express) steaming into the shattered remnants of trains already wrecked and with their passengers and their effects strewn across lines. One disaster fed into another disaster. The casualty figures, high enough, would have been higher still were it not for the swift attention of passing detachments of the United States Air Force, who rushed to the scene of the disaster and applied life-saving field techniques learnt in wartime.