Well if you place your pre order in by Friday, you can order the Polar Express 0-6-0 switcher for starters.
Other than the Berkshire (two &1/2 runs), and the electric, there were no other Polar Express locomotives painted up by Lionel.
BTW the Polar RR K4 is really a passenger locomotive. While it can pull freight, you are limited to the amount of freight cars it can pull if you look at the 1:1 specs. A 2-8-2 Heavy Mike (Lima's super power H10) would be a nice addition to the Polar Express Line to pull those freight cars. If the Polar Express freight continues to expand, Lionel may have to offer a (Lima) J1 2-10-4 to pull them all!