Strap rail seems to be often found in older abandoned mines in North America (source: watching hours of TVR Exploring and Mine Explorers -videos on youtube ( ht

Strap rail seems to be often found in older abandoned mines in North America (source: watching hours of TVR Exploring and Mine Explorers -videos on youtube ( https://www.youtube.com/@TVRExploring/videos https://www.youtube.com/@TVRExploring/videos https://www.youtube.com/channel/UCxhNU-gNyPq2lXA7JhLB90Q/videos https://www.youtube.com/channel/UCxhNU-gNyPq2lXA7JhLB90Q/vid... )).