Passengers on Amtrak train from Chicago to Detroit and Pontiac delayed hours

Detroit police are investigating a About 140 passengers on board the Amtrak "Wolverine" train number 354 from Chicago to Detroit and Pontiac have been stuck on the train for some 13 hours.  They tell 7 Action News they have been told the delays were caused by a switch in the tracks near Chicago and snow on the train. They say they've gone through four crew changes.