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It was a feature of the highly successful Aurora HO slot cars of the 1960s and 1970s. The motor was not a separate unit; instead, its individual elements - magnets, armature, commutator and brushes - fit into recesses in the blocky chassis.

Aurora AFX Vintage GX1250 Complete Slot Car Set Great Cars & GX1100 Box & Track.

The original '71 A/FX chassis utilized an updated version of Aurora's "Thunderjet 500" line, popular in the '60s. AFX introduced the innovative "G-Plus" in-line motor chassis in 1976.