PONTIAC - The Union Pacific railroad tracks south of Pontiac were repaired and operating normally Thursday afternoon, a day after about a third of a 33-car freight train derailed there. | Photo gallery | Video

The main line was cleared, repaired and reopened at 3:12 p.m. Thursday, said Union Pacific spokesman James Barnes. A siding had been cleared and reopened by 5:30 p.m. Wednesday, allowing freight and Amtrak trains to pass.

"We rerailed most of the cars and are replacing portions of the track that is damaged, and we should be able to pull those cars," he said Thursday afternoon.

Amtrak spokesman Mark Magliari confirmed that passenger rail service on the St. Louis-Chicago route was back to normal by Wednesday evening.

Ten empty grain cars at the end of the train derailed about 9:38 a.m. Wednesday near the intersection of Old Route 66 and Livingston County Road 1500 North, Officials said. Of those cars, four were on their sides.

The train had seven cars hauling Prairie Central Co-op grain from Lexington, but 26 cars were empty, officials said. The loaded cars were in the front half of the train, which did not derail.

A witness reported seeing the back of the train start to bounce before the derailment, but Barnes said the cause remains under investigation.

There were no injuries and no materials spilled, Barnes said.