US Highway 93 is open now after being closed for more than 24 hours to clean up a train derailment near Olney.
The road reopened Sunday night. Forty-five empty coal cars went off the track around 3:00 p.m. on Saturday.
No one was hurt.
The train was heading east from British Columbia.
Some of the cars fell off a bridge over the highway.
BNSF says they are still trying to find out what sent the cars off the tracks.