The Lionel Santa Fe No. 6220 Switcher was used as a test vehicle for Magnetraction in 1949. Like its O gauge counterpart, No. 622, this diesel had problems holding its Magnetraction during the first year of production. This engine always had a BLACK body with WHITE lettering "A.T. & S.F." on the sides with a "Santa Fe" decal. Equipped with a three position directional unit whose control lever was adjustable from the bottom of the die-cast frame, a bell, interior lighting at both ends, and electronic couplers, this engine was an excellent runner. There are two variations:

Variation A: Large GM decal on cab (1949).

Variation B: Small GM decal on the lower front of the body, magnets placed directly on the powered axles (1950).

Lionel issued this diesel for use on O27 gauge track, but it will also operate on the larger radius curves of O gauge track. Similar to the No. 622 except for the number change.