CUT BANK, Mont. (AP) — Rail traffic has resumed across northern Montana after a dozen loaded grain cars derailed just east of the Blackfeet Indian Reservation, but the track closure caused issues for Amtrak's Empire Builder.

BNSF Railway officials say the cars derailed Thursday afternoon after crossing a trestle over Cut Bank Creek just northwest of Cut Bank. Grain spilled on the ground with some falling down the hillside toward the creek.

BNSF Railway spokesman Ross Lane says the damaged cars were removed and rail traffic resumed at 9 a.m. Friday. No one was injured.

Amtrak spokesman Marc Magliari said passengers were bused between Whitefish and Shelby on Thursday and the trains were returned to their starting points in Seattle and Portland or Chicago. With the trains out of place, trains leaving from Portland and Seattle on Friday and Chicago on Saturday were cancelled.