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Have you ever seen the dimples in traincars and locomotives? You'll always notice them now... They were used for a practice called "poling" - which was once a norm in railroading, it was never officially ruled against, however it fell out of practice. For good reason too.
This is a video series from the Lake Superior Railroad Museum in Duluth, Minnesota. Learn more about the museum at: www.lsrm.org and watch all of the 100's of videos at www.duluthtrains.com/videotours