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If a railroad sandwiches a group of empty railcars between two sets of heavy coal cars, those lighter cars are more likely to be squeezed and pop off the tracks when going downhill.

On average, a man died in the mines every day, often crushed by coal cars or killed by explosions.

Atop of coal cars, they arrived at a displaced persons camp.

Violence broke out when special deputies attempted to escort a coal car across a picket line, and two strikers were killed.

They do not think of such vehicles as 27.4 percent coal cars — that being the percentage of U.S. electricity generated by coal-fired power plants.