Steve:wav: , you are kinda in a rock in a hard spot on this one:frowns: . i am pretty sure the MP series switchers come out in 1974:winki: . so everything that has already been mentioned holds true:frowns: . i guess it boils down to where do you draw the line. i can understand not wanting to paint the engine, as sometimes that a real pain in the...backside:119: .
i just came to the conclusion that my modeling just wasn't going to be 100% accurate

ops: , i had to draw the line somewhere:winki: . do like i do, do as you like, and just say your layout is freelanced, with prototypical aspirations:thumb: . there are engines i love that UP just didn't have, so i am making them up as leased units:winki: , even though my current layout is based from '69-'79. it was hard for me to do this, so i know how you feel, but the line has to be drawn to do what you want to:thumb: .
OR, patch them, look at BN, hardly anyone mentions all the roads they ate up

, and they patched units till they went black & green:winki: .
just my thoughts, the choice is yours:winki: . good luck with however which way you decide to go:thumb: .
P.S. hey, i darn sure wont call the modeling Police on ya:winki::119: .
P.S.S. Here's a quote from George Sellios: "its your railroad, you run it the way you want to":winki: (that was taken from an Allen Keller DVD)
:deano: -Deano