The Lionel Wabash F-3 No. 2240 was produced on a BLUE and GRAY shell with WHITE trim. YELLOW and heat-stamped lettering was inscribed on the sides of this diesel that was only available in 1956. Reproduction shells have silk-screened application of these colors. The chassis is BLUE, as is the pilot skirt on the A Unit, and the truck side frames are BLACK.

This engine has louvered roof vents, filled in portholes, cast in side ladders, magnetic disc coupler on the front end of the A unit. All other couplers are solid and non-operating. This diesel was equipped with a horn that was operated by a D Cell battery, and a three position directional unit whose control lever was adjustable from underneath the chassis. The single vertical worm drive motor powers two axles that utilized Magnetraction. There are no variations.

All of the Lionel F-3s are designed to work on the larger radius of O gauge track. When used with O27 track this diesel will scrape the switch machine housing on No. 1122 O27 switches when passing through the curved turnout. Evidence of scrapes on the fuel tank of these diesels is a sure indication of operation on O27 track.