Model: The locomotive comes with a digital decoder, controlled high-efficiency propulsion, and a sound effects generator with many functions. Powerful can motor with a bell-shaped armature and a fly-wheel, in the boiler. 4 axles powered. 2 traction tires. The headlights will work in conventional operation and can be controlled digitally. A 72270 smoke generator can be retrofitted into the locomotive. The smoke generator contact, steam locomotive operating sounds, which vary with the speed of the locomotive, a whistle, as well as the acceleration and braking delay can be controlled digitally with the 6021 Control Unit or Märklin Systems. Other operating sounds can be controlled digitally with Märklin Systems. The engineer's cab has interior details. There is a permanent close coupling between the locomotive and tender. The locomotive has many separately applied details. Length over buffers 21.0 cm / 8-1/4".