Postwar Lionel 773 Hudson. It's on my layout the most. Here's the 1950 version.
Lionel postwar 2356 Southern ABA diesels. Having grown up in the south, I really like the Southern paint scheme.
Kusan-Auburn postwar Santa Fe F-7 AA units in the freight color scheme. Came equipped with four traction tires and could operate on either two or three rail track.
Kusan postwar Atomic Engine, complete with gun turret. This engine pulled the Kusan Atomic Train.
Finally, a Lionel postwar 2358 Great Northern electric. Nice colors.