One missed signal led to disaster 😱 #history #traincrash #shorts In 1952 near Harrow, thick fog,...

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[00:00:00]A single blocked signal caused one of the deadliest train [music] crashes in history. In 1952 near Harrow in London, a local train passed a caution signal in thick fog, then ran into a stopped train ahead. Seconds later, another train slammed into the [music] wreckage.

[00:00:16]Afterward, railways expanded automatic warning systems because when visibility fails, backup alerts save lives.