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3-D printed U-channel hopper cars

I model the Western Maryland Ry. (WM) from the 1920s to before the start of World War II. Appropriate commercial models of coal hoppers for my modeling era are limited in large scale. I was using LGB ...
NPR

It's dangerous, illegal and uncomfortable — but train hoppers ride the rails anyway

A moving train fills the frame of a shaky video. A ladder looms, and hands grip the rungs. A blur of movement, and you're inside an open train car piled with coal, trees whipping by on either side.