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 http://www.duluthtrains.com/videotours