Prototype: Diesel locomotive 770 "Hummel" "Bumblebee" of the Czech Railways. The heavy six-axle diesel locomotive is called Čmelak (in English: Bumblebee) and is known to all its fans under this nickname. It was not only its Diesel sound which was responsible for the name but also the external appearance that made it an important locomotive. The locomotive was an export order for the former Soviet Union. With approx. 8200 locomotives the Čmelak and its unique design belongs to the most-built locomotives of the world. New design with many separately attached details that are partially etched. 5-pole engine with mass flywheel. One axle is equipped with traction tires to increase traction power. PluX22 interface. LED triple headlight red and white that changes with the direction of travel. NEM 362 coupler pocket with close coupling mechanism. Sound version.