Here is a set of four different Marx 6-inch tin freight cars. There is a #551 black and gray New York Central tender, a #90171 red Bessemer & Lake Erie plug door boxcar, a #3824 yellow and brown Union Pacific caboose, and a #556 red New York Central caboose.  All of the cars are equipped with 4 plastic wheels on metal axles and have the punched tab sliding style tab and slot couplers, so these were likely all out of windup or battery powered train sets.  Great for operators, customizers, or people needing parts.  Look over the photos as THEY are the description here.  Photos from all 6 sides, with a penny in the shots for size reference.  Priced to sell, with only actual USPS Ground Advantage or Priority shipping for the 1 1/2 pound package charged!