This section covers HO scale detail parts from R1 to S21, including rerail frogs, wheel stops, MU stands, snow shields, steps, and smoke stacks. The rerail frogs (R1, R2, R4, R5) are cast brass and are used to align wheels on trackwork, particularly at fouling points or where derailments occur. They are mounted between the rails, and the frog's flangeway guides wheels back onto the railhead. Wheel stops (S1, S2) are brass castings that bolt to the end of a siding or staging track to prevent overruns. They can be painted and weathered to match the rail. These parts suit most HO scale locomotives and rolling stock, and are ideal for scratchbuilding or upgrading commercial track.

The MU stands and snow shields (S10, S11, S12) are fine castings for diesel locomotives. S10 and S12 are multiple-unit electrical stands, typically mounted on the rear of a locomotive or on a trailing unit. S11 snow shields are fitted over the radiator fans on SD units to prevent snow ingestion. These parts are delicate and should be handled with care. They are best attached with cyanoacrylate or epoxy after cleaning the mating surfaces. The stands may require drilling for mounting wires. These items suit HO scale EMD and GE diesels from the 1950s onward. For GP9s, S12 is specifically shaped to fit the hood contour. Use a jeweler's file to fine-tune the fit if needed.

The steps and smoke stacks (S15, S16, S17, S17a, S18, S18a, S19, S20, S21) are for steam and diesel locomotives, as well as cabooses. The Canadian steps (S17, S18) are available in brass or plastic (the 'a' suffix denotes plastic). These are typically used on Canadian National or Canadian Pacific locomotives and cabooses. They are mounted to the car body or frame with small screws or glue. The smoke stacks (S19, S20, S21) are for steam locomotives, with different shapes for various prototypes. They are cast with a base that can be filed to fit the boiler. All parts are unpainted and require cleaning with a solvent to remove any mold release. They can be soldered (brass) or glued (plastic) after test fitting.