Metra said the incident involved an Amtrak train at a grade crossing at Caldwell and Lehigh avenues. An Amtrak spokesman said an Amtrak train from Milwaukee to Chicago hit the bumper of a vehicle.
Inbound and outbound train service was halted before trains began moving again at about 8:30 a.m.
The Amtrak spokesman said there were 150 passengers and crew aboard the train and no injuries have been reported.