I would like to see the Northern Pacific F3 in the pre-1954 passenger scheme. Those were almost always run in an ABB formation, as I understand it, which makes for a nice continuous line on the "butter knife" with the passenger cars (hopefully the GGD North Coast Limited will be done in this scheme eventually).
The post-1954 scheme is nice, but it has been done to death, just my opinion, of course. The original pre-1954 scheme has not been done on an F3 in O scale, as far as I know. MTH did some F7 a few years ago, but they were really poorly done, the colors were way off and they were sold only as an ABA set.
