Thunder Basin Coal Company, a subsidiary of Arch Coal, operates the four Black Thunder mines in the Powder River Basin. South Black Thunder Mine is probably the mine that loads the fewest train (out of the four). There is only one long track that runs 9.8 miles around the load out balloon track. Here, UP 9578 has completed loading and is waiting for a crew. An inbound BNSF empty waits to head to the load out in the distance. South Black Thunder loads a little slower than other mines, taking roughly 3.5 hours to fully load a train.
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