Truck Trailers Car No. 6440 was produced from 1961 until 1963 on a RED unpainted 6511-2 mold that came with AAR trucks. The only variation has one instead of both disc couplers. Slots on the trailers are there for name plates, but no name plates were included. Original trailers are embossed "MADE IN U.S. OF AMERICA / THE LIONEL CORPORATION / NEW YORK, N.Y." in three lines on the bottom.