My favorite colors are the Red and Silver passenger set of locomotives.
Back in the early '70's., my wife bought me MPC/Lionel GP7/9 powered and dummy Santa Fe freight locomotives.
At the time I did not know any better, as the locos. were black and yellow.
Now, I know that these MPC/Lionel locomotives are a fantasy color scheme, had I known back then, I might have brought them back.
Ralph