Model: With digital decoder, controlled high-efficiency propulsion, mechanism for cooling fans in the tender, and sound effects generator with many functions. 4 powered axles. 4 traction tires. 2 Märklin 7226 smoke generators can be retrofitted. Headlight, smoke generator contact and fan cooler wheels in conventional operation. These functions, speed-dependent steam locomotive sound effects, as well as acceleration and braking delay can be digitally controlled with the 6021 Control Unit. Additional operating sound effects can be digitally controlled with the 60652 Mobile Station and with the 60212 Central Station. Locomotive and tender with NEM coupler pockets. Distance between locomotive and tender can be adjusted. Length over buffers 35.5 cm / 13-31/32".