The HO Class D 4 Truck Shay Locomotive, adorned with the Southern Railway number SOU #4001, is an impressive representation of historic steam engineering. Known for their unique geared drivetrain, Shay locomotives were designed for heavy hauling, particularly in logging and industrial applications. This locomotive features a robust construction that includes a heavy die-cast boiler, tender body, and chassis, ensuring maximum weight for enhanced tractive effort. With an intricate design, it is equipped to handle rough terrains and steep inclines.

Powered by a powerful 5-pole can motor and precision drive mechanism, the model is engineered for continuous heavy load towing and smooth slow-speed operation. It is combined with the latest Paragon4 Sound and Control System, which offers accurate prototypical sounds and operating smoke units for an immersive experience. With a minimum recommended radius of 22 inches, this locomotive integrates details like factory-installed engineer and fireman figures, along with many separately applied details like handrails and ladders, making it a perfect addition for collectors and hobbyists alike.