Here is a Marx Toys tin lithographed 6 inch O gauge freight train.  All of the items in the set are postwar versions of these.  The set consists of 5 pieces: a stamped steel 0-4-0 steam engine with plastic boilerfront (which is complete and intact), a #551 New York Central black tender with white lettering, #738701 Pennsylvania red high side gondola with silver lettering, a #553 UTLX silver single dome tankcar with red lettering and black details, and a #20102 NYC caboose in red and gray with white lettering and black details.  All of the cars have 4 plastic wheels on metal axles and have the punched sliding type tab and slot couplers on them.  The set is used and the cars show a fair amount of playwear and some corrosion.  I tested out the engine, and it runs fine - I posted a short video of my bench test of the engine.  Great for the layout or around the tree at Christmastime, or perhaps to add to your collection of Marx!  Photos show all of the items from all 6 sides.  Also added a closeup of the underside of the engine, so you can see that the bracket to hold the sparkler flint is still present, although it needs a new flint to work. NOTE: THE WINDUP KEY IS NOT INCLUDED, but you can purchase those, along with the flint you would need for the sparker, from Robert Grossman (google him if you need Marx parts).  Priced reasonably, with only actual shipping on the roughly 2 1/2 pound package charged to the winner (I do give you a number of shipping options, so you can pick what works best for you).