Evolution of railway signaling, from flags to 4G network. 12:50 video:
https://www.youtube.com/watch?v=ABVT8MOYb1g
Previously:
https://www.homemadetools.net/forum/...159#post165239
https://www.homemadetools.net/forum/...430#post158446
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Evolution of railway signaling, from flags to 4G network. 12:50 video:
https://www.youtube.com/watch?v=ABVT8MOYb1g
Previously:
https://www.homemadetools.net/forum/...159#post165239
https://www.homemadetools.net/forum/...430#post158446