Flat Car No. 6401 was issued in 1965 with no load. At the bottom of page 14 in this year’s catalog it says, "No. 6401 Flat Car — perfect for carrying cars, crates and accessories." Produced on a GRAY No. 1877-3 frame, this car is undecorated and without the truss bars and it has been found with both AAR and arch-bar trucks, but usually came with AAR trucks with solid non-operating couplers. Lionel created a special box to house this car. A very difficult car to find, especially with the box.

Variation A: LIGHT GRAY car that is the most common version of this car. It came with various loads and was issued in sets in the mid-1960’s. No. 6401 defines a car with no load.

Variation B: DARK GRAY car that used mold No. 1877-3.