I've run mine on the old '70s vintage Atlas track, which has a 24" ( ) radius. It actually works, even with its body-mounted couplers...although I'm sure you'll want to go with something that looks better.
Also (and you probably already know this) the stock axle gears are prone to splitting, so you'll want to replace them with a set from NWSL. Interestingly, when I got mine it had only (3) geared axles; one was just a "blank"...
Mark in Oregon