i have seen williams F3's and lionel F3's in a grey (or is it brown?) livery with yellow bordered orange nose display and stripe running along the bottom of the unit's sides.
i assume this is a prototypical paint scheme. if it was, what time frame is it from and was it passenger, freight or dual purpose?
The background color would have been grey, not brown. Illinois Central units were similar to the Milwaukee's, with the orange striping bordered with yellow, but with a dark brown background color.
Some of the Milwaukee Fs were in the livery you're describing, and some in the livery that appears on the Milwaukee Fs shown in the new catalog.
These engines could be seen pulling passenger as well as freight trains.
The Lionel Postwar engine paint scheme looks nice, but is not prototypical, with the "flame" front, and the orange color used was too reddish. Lionel did F units in the 90s (No. 18140) which were prototypically correct, for that particular Milwaukee livery.
