The Moorgate tube crash occurred on February 28 1975. At the height of morning rush hour, a crowded tube train slammed into a dead end at Moorgate station. It was over 12 hours before the final survivor was rescued. 43 people died and many more were badly injured.
One of the reasons I remember Moorgate so clearly (I was only 8 at the time) is that someone with the same first initial and last name as my mother was on the list of those killed. My mother was nowhere near Moorgate, and due to claustrophobia wouldn't travel on the tube anyway, but it was a while before all the worried friends and relatives could be reassured.