Investigators are trying to determine what caused the derailment Tuesday evening in Platte County near Farley.

BNSF spokesman Andy Williams says seven cars went off the tracks and overturned, while five went off track but remained upright. They were part of a train with 88 cars and three locomotives heading from Lincoln, Nebraska, to Kansas City, Missouri.

Williams says none of the cars contained hazardous materials.

He says the cars were put back on the track early Wednesday and operations will resume after the tracks are inspected.