Evolution of railway signaling, from flags to 4G network. 12:50 video:
Previously:
Railroad switchman lantern hand signal - photo and video
Railway semaphore signals - photo
Evolution of railway signaling, from flags to 4G network. 12:50 video:
Previously:
Railroad switchman lantern hand signal - photo and video
Railway semaphore signals - photo
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jimfols (Oct 26, 2020), toeless joe (Oct 26, 2020)
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