I think the Milwaukee Road's Coast division will be a good because when the news when steam was coming to train sim world and he mentioned the old Milwaukee Road electric locomotives and those locomotives are the Little Joes and Boxcabs. And the route should be set in the early 1960s because they had a diesel locomotives that was retired by 1963 that were the Fairbanks Morse Erie Builts and C Liners. And a very electric and diesel locomotives they could add on later as DLCs are the FM H-10-44s and the ALCO RS-1s for the diesel list. For the electric locomotive list are the EP-2 Bipolar locomotives, ES-2 electric switcher.
Those FM Erie-Builts are beautiful. I would love to see them on the Hiawatha. SD40s, FP45s, or SD45s would be awesome to see as DLCs, too, as well as the Milwaukee Road's SDL39s.
This will be the first American route to use 3kv DC OHLE since the Milwaukee Road opted for DC electrification system long-distance unlike Pennsylvania and New Haven Railroads alternating current 11kv 25hz NEC New York TSW2020.
I agree with you with on the FM Erie Builts and they were ran on the New York Central, Union Pacific and the Santa Fe Railway but my favorite one is the Milwaukee Road livery because of the big chrome piece on the front of the locomotive because it looks a big car girl from the '50s and the sad thing is they all been scrapped and after 82 cab units and 29 booster units they built, couldn't at least saved just one cab unit or a booster.