The Sunoco Single Dome Tank Car No. 6015 was produced in 1954 and 1955 with a chemically blackened frame without steps that has bar-end trucks. The earliest production painted over the GRAY No. 6035 tank bodies. Other variations were not painted. Some late 1955 production cars have tabbed couplers. Car graphics were applied with a rubber stamp and are prone to wear easily. Caution should be used when cleaning this car.

There are three variations:

Variation A: Lionel used up the remaining GRAY car bodies of the No. 6035 by painting them YELLOW. This is the rarest of the variations. Early 1954 release.

Variation B: MEDIUM YELLOW car body.

Variation C: DARK YELLOW car body.