It is to celebrate the 150th anniversary of the Union Pacific Railroad. Imagine that, a company successfully in business for 150 years!
Congrats to my friends at UPRR. Enjoy the video.
UPDATE: Terrific comment at the original posting about this train:
Mike BMay 6, 2012 11:25 AM
I hope they don't have a problem with railfans clogging the roadways when this passes through Dickinson County. ;)