What Happened to Semaphore Signals? | History in the Dark

Описание: One of the earliest methods introduced for railroad signaling was the semaphore signal. It was invented in Britain, and by the 1870's became the most popular signal on railroads all over the world. But they aren't nearly as popular as they once were. Why not?

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https://en.wikipedia.org/wiki/Railway...

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#history #trains #railroad #semaphore #signal