The 2242 was always sold as an AB combination. Even with a single motor and Magnetraction, it is a powerful locomotive. The 2242 was available as a separate sale item as well as the lead locomotive of two freight sets: set 2507W in 1958 and set 2537W in 1959. It's interesting to note Lionel catalogued this diesel as a Super-O diesel -- the only time a single-motored F3 was catalogued as a Super-O diesel.