Three Union Pacific locomotives pull (or static display?) a passenger train. This is a very unusual sight besides all the Amtrak Trains.
This is most likely the Safety Awareness Train, a programm where UP wants to promote public safety at railroad crossings.
Pictures of the train here:
http://jeffcity.media.clients.ellingtoncms.com/img/photos/2011/05/03/cdtrain_t670.jpg?b3f6a5d7692ccc373d56e40cf708e3fa67d9af9d