There is a Reason its a mod, I know I am a few months late on this, but some players may one to have their railroad not be in 1955..

anything that's over 1960's shouln't be in Railroader that's Based in 1955. between 1955 & 1960's is exceptional & can give it a pass, but the GP38 model was released in 1966.
this is just Unrealistic for the real train fans & Gamers alike.