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Investigators haven’t confirmed the cause of the Sept. 14 blast in a remote corner of the railroad’s Bailey Yard in North Platte, Nebraska, about 250 miles west of Omaha.

Two of them are in Chicago; one is in Lewiston, New York; one in North Platte, Nebraska; one in Ogden, Utah and one in Detroit, Michigan.

No one was injured in the blast at Union Pacific’s massive railyard in North Platte, and no structures were damaged.

Around noon, an explosion occurred inside an intermodal container on a railcar at Union Pacific’s Bailey Yard in North Platte, though it wasn’t clear what caused the explosion, railroad spokeswoman Robynn Tysver said.

But the letter didn’t detail what kind of defects inspectors found in the Bailey Yard in North Platte, and there are a myriad of federal rules.