The load was five plastic SILVER pipes that today are frequently found to have cracks along their length.
Better quality reproduction pipes are thicker and a different color that hold up better than the originals. Lionel made these pipes available for separate sale under the No. 6511-24.
This flat car was produced with stamped steel truck mounting plates on Type 6511-2 Die 1B bodies. Originally blackened die-castings, these plates show rivet detail on the top. The trucks were mounted to these plates that wrapped around the car ends and were secured to the chassis with screws. The trucks that were used were bar-end, and later issues would have tabbed couplers. Also see: Pipe Flat Car No. 6311.
There are five variations:
Variation A: BLACK chassis that is painted BRICK RED and has die-cast truck mounting end plates.
Variation B: Identical to Variation A except the chassis is painted a DARKER RED color.