The prototype for this model is Harz Narrow Gauge Railways Road Number 99 7239-9 as seen in Era VI. It is prototypically painted and lettered. The model has a built-in mfx/DCC decoder with extensive sound and light functions such as headlights that change over with the direction of travel, cab lights, and separate controlled running gear lights. All five driving wheel sets are driven by two powerful Bühler motors with ball bearing, and the locomotive has traction tires. The locomotive has a smoke generator with smoke chuffing synchronized with the motion of the wheels. The locomotive has many separately applied details, a completely detailed cab, and doors that can be opened. Length over the buffers 55 cm / 21-5/8".
The 37734 buffet car as well as other HSB cars are available to go with this locomotive.