I have a few All Nation locos, and they run more like a real steam engine than most spark trains in that, with the original open-frame motors, you have to give them a lot of throttle, then back off as the thing starts to move, or they will jackrabbit or spin the drivers. As delivered, they aren't for rivet counters but, with effort and enjoyment, they are a good platform for remodeling.
Here are a few shots of my GM Ten Wheeler, which I reworked extensively to represent an SP TW-10 (?). Sadly, these shots are AFTER one of my cats knocked it off the piano, but you can see it's humble heritage if you look closely enough.
Lotsa grinding and fabbing, but I am pleased with the results. The scratch-built Vandy tender houses a speaker and pickup for PFM SSII sound which, to me, is the best steam sound system ever produced.
Loves me some trains,
Mark in Modesto