My favorite, and it is fairly common in the internet auction, where you wil probably see at least one, as well as an ATSF stock car, in a search, is the "3/16" LNE hopper..
I just wish Marx, after that expensive tooling, with operating hopper doors, etc.,
had made the hopper in a lot more road names than just the one. The equally popular "3/16" stock car was available in two roadnames, the bright orange ATSF, and brown and less appealing pre-war Pennsylvania. I am guessing the bright colored ATSF car grabbed the kids' attention, but there were other roads with bright colored stock cars whose lettering I would have liked to see. These three Marx cars were less common in sets, and I can see the hopper being more expensive to produce, but the stock car not so much more although with extra punched sides and different doors, utilizing the boxcar body stamping. (I could visualize the hopper, with a change in tooling, as a two bay and a 3 bay)
I was hoping the New Marx would produce identical "3/16" cars, WITH different livery
than original, but no luck. They had tooled up the trucks and couplers, a big investment...but the bodies were smaller...