'This is an end view of one of our new steel mine cars on a cage at one of the White Oak Shaft mines, and the signal has just been given to hoist it to the surface, 450 feet up! These electric equipped hoists can hoist a car every twenty seconds and dump it! The cars are placed on the cages and automatically by creeper chains and car stops. One man operates the signals and car stops and chains.'
Subjects:
Mine railroads--Cars., Coal Mines and Mining--Preparation Plant Interiors., Coal mines and mining.
