A small memorial beside Harrow & Wealdstone station marks the site of the 1952 rail disaster that killed 112 people during the morning rush hour. The crash involved three trains and the collapse of a station footbridge, and unfolded within seconds. The subsequent public inquiry led to significant changes in British railway safety, including the accelerated adoption of automatic train protection systems.
The memorial is modest — a plaque rather than a monument — and the station itself is a busy interchange with no obvious trace of the disaster. It is not a destination in itself, but if you are passing through the station it is worth a moment's attention. The event is well documented in railway history and the subsequent Holden Report was a landmark in transport safety legislation.