I would like to see the first American Spirit of Steam route on the Northern Pacific's Tacoma Division which ran between Tacoma and Yakima Washington and the locomotive should be the A-A3 class 4-8-4 Northerns and the 2-8-8-4 Yellowstones which both were pioneered by the NP and later for DLC they could add the Z-6 4-6-6-4 Challengers which were both used to pull freight and passenger trains like the North Coast Limited and maybe some 0-6-0s and 0-8-0s for yard switching and the most famous locomotive on the NP was locomotive no. 2626 which was the first locomotive in the world to be equipped with Timken Roller Bearings and was the railroad's only class A-1 which was built by Timken in 1930 as no. 1111 and was sold to the NP in 1933.
Here are some pictures of some locomotives on the Northern Pacific. Northern Pacific 2600 class A 4-8-4 Northern Pacific 5000 class 2-8-8-4 Yellowstone Northern Pacific Class A-1 No. 2626 Former "Timken" 1111 first steam locomotive to be equipped with Timken Roller Bearings.