The Swiss mountain locomotives that pulled heavy freight trains over the Gotthard grades are known as "Crocodiles". The design (hoods mounted for articulation, stretched out shape) and the color green gave them their name. These units "snaked" like a reptile through the curves when negotiating turnout combinations and S curves.
 
This set includes 2 different locomotives, a dark brown version as it originally looked around 1922 with open buffer and walkover end plates plus a pine green version as it looked in the 1950s with solid buffers and wrong track operation light. Both highly detailed locos feature metal frames and bodies, mfx digital decoder, extensive sound functions, 2 controlled high-efficiency propulsion systems with flywheels per loco, 1 motor for each powered truck in each loco, 3 axles and jackshaft powered, traction tires and articulated frames plus swing out hoods, safety grills beneath pantographs and many separately applied details. Lighting is warm white and red LEDs. Power can be switched to catenary.