The model comes with the standard A.C. Gilbert American Flyer-compatible oversized couplers and hi-rail (tall-flange) wheels.
However, the box includes the Kadee-style S-scale couplers as well as replacement wheelsets with code 110 wheels. Installing the couplers was near trivial. The box comes with thin shims that can be installed between the coupler and the body. The wheelsets were relatively easy to replace by twisting the sideframes in opposite directions.
The doors open on these models. This is the same as what the original S-Helper Service models did. The interior reveals wood-grained floor boards.