I've been indulging in some Marx and Hafner clockwork this year. I picked up a neat postwar Marx set at the Old Colony Model Railroad Club's Show last weekend.
I don't think it's anything rare or remarkable but I like it anyways. The cars have black plastic wheels and twisted sliding couplers, so it must be postwar, although I don't know much else about it (maybe some of the Marx experts can make commentary on it). After dusting, cleaning and lubing, the set was ready for the track!
Despite all the modern thingamajigs cluttering my layout, the little clockwork Marxies can still manage the mainline pretty well!