Train comes up behind men walking inside tunnel.
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Previously:
https://www.homemadetools.net/forum/...389#post204573
https://www.homemadetools.net/forum/...341#post211642
https://www.homemadetools.net/forum/...185#post188133
https://www.homemadetools.net/forum/...381#post211802
https://www.homemadetools.net/forum/...504#post208960