americantrainz has some really good stuff. got a bunch of phase III stuff from there and i still use it whenever i'm recreating 90s railroading. If you're looking for engines, Jointedrail has Phase II and Phase III F40s and a Phase III P42 (praying they eventually make the P40), Americantrainz also has some nice P42s and P40s if you're not into realism. DLS has some eh stuff but it still looks decent.