to whomever you are since you didn't sign your post.
To answer your question. either will do since they represent different
models. The p2k is an ACF Type 21 and the Intermountain is an ACF Type 27.
The paint and lettering on the P2k can be trusted, and most of the IM paint
schemes are correct but should be verified.
Brian J. Carlson, P.E.