Iowa ? An Amtrak locomotive caught fire Saturday, delaying the Chicago-bound train carrying 164 passengers but causing no serious injuries, authorities said.

The crew separated the burning engine from the passenger cars in southeast Iowa.

“We will be severely delayed,” Amtrak spokesman Cliff Black said. “But we need to get the people to their destinations.”

The diesel engine, one of two, caught fire shortly before 5 p.m. in an apparent fuel-related blaze, he said.

“We don’t know what ignited it, perhaps a leak,” Black said.

Lockridge firefighters extinguished the blaze, officials said.

The train left Emeryville, Calif., near Oakland, on Thursday and was to arrive in Chicago on Saturday.