These electric trains pulled cars used to haul salt from the mine. Each of these cars held 3 ½ tons of salt and took 90 minutes to load by hand. Explosives were always carried in a separate car, that had taller sides on it to protect from sparks. Now miners use a conveyer system to move the salt, but at one time they used these trains and would move the track as the mine face moved. You will notice the trolley pole which picked up electricity overhead from the track called a catenary.