I really love the look of old tinplate cars, but I really don't care for the looks of tinplate engines.
So, I pull all of my tinplate cars with small to medium conventional locomotives.
The little Williams 44 ton Scale switcher looks really cool pulling a train of short Marx tinplate cars. An 0-4-0 steam switcher or A5 would look great as well, but I haven't bought one yet.
Mannyrock