Here is a K-Line O gauge #5110 Southern red plastic sliding door boxcar with white lettering.  It has been converted over to Marx by putting a Marx underframe on it - one with the stamped metal type G truck side frames and 8 DIECAST metal wheels on metal axles, and with plastic tilt style couplers on both ends(the prior owner likely wanted to add some weight to make it track better). Decent shape, and a chance to add something different to that Marx layout!  No box with this one.  Should be a great addition to someone's Marx or K-Line collection out there!  Photos show the car from all 6 sides, with a yardstick in the shots for size reference.  Priced to sell, with only actual USPS Ground Advantage or Priority Mail shipping cost charged to the winner!