Ooohhhh very nice! Good selection for a train.
I model the UP Heritage Train, with the UP 844 and Challenger.
I have 10 Walthers UP Passenger cars. Some are just the basic UP City series cars, as well as the heritage cars they now offer.
I have the Willie James, Colorado Eagle, and the very new released Observation Dome with Challenger sign on the back and lights included.
I run both locomotives with the water tender, which is from the Athearn Turbine Tender that was sold separately.
Start here:
http://www.up.com/aboutup/special_trains/steam/index.shtml
and here:
http://www.uprr.com/newsinfo/releases/heritage_and_steam/2011/1010_centennials.shtml