Art,
The E'7s where usually on the Omaha bound trains in the 1950's the FP7's where on the Olympian and TC Hiawatha in that time frame as they where the newest passenger power at the time, when the E9's (in UP paint) where delivered in the late 50's early 60's those went onto the Olympian, TC Hiawatha's and the UP passenger trains, But than its your railroad........ so do what you like the most