One of the vehicles was damaged so badly it may need to be replaced at a cost of $750,000, according to fire department records.
Rudy Husband, spokesman for Norfolk Southern, which owns the equipment, said an accurate damage estimate hadn't been made by the company.
The equipment is used for track repairs, Husband said. "We move equipment throughout the system when work needs to be done in southwest Ohio," Husband said.
The investigation into the fire continues.