In The Last Battle, all of the Friends of Narnia (except Susan - the people from our world who had been to Narnia over the course of the seven books) die in a horrific train accident and end up going to the Narnian heaven which connects to our world's heaven. The train crash is described as resulting from an incoming train taking a bend too fast, but as far as I remember, it claims the lives of people in the incoming train, people in a stationary train, and even people standing on the platform.
Today, thanks to Wikipedia's "On this day", I learned about the Harrow and Wealdstone disaster, a three-train crash which took place in 1952 and was severe enough to kill platform onlookers, with some train carriages mounting the platform and even penetrating an overhead footbridge. The timing seems to fit with the disaster in The Last Battle: a decade after the WW2 evacuations of The Lion, the Witch, and the Wardrobe, and a few years before the publication of The Last Battle.
Did the Friends of Narnia die in the Harrow and Wealdstone disaster? This is a question in two parts: (1) out of universe, was the train crash in The Last Battle inspired specifically by the real-life Harrow and Wealdstone one? (2) in universe, is it consistent with the events of the story for them to have actually been in Harrow and Wealdstone on 8 October 1952?