The Gm 3/3 is a three-axle diesel-electric shunting locomotive of the Rhaetian Railway in gauge 1000 mm. Three machines with the road numbers 231 to 233 were put into service between 1975 and 1976 with the aim of performing heavy shunting services and being used in large snow clearing operations. The locomotives have a weight of 34 t and reach a maximum speed of 55 km/h.

In 2021, all three locomotives were sold to the Dampfbahn Furka Bergstrecke, whereby one model remains in service and the other two will serve as spare parts storage.
As a G scale model railway, we will recreate the 232 – actually the last remaining locomotive that is still running.