VR Class Dr12 (original designation Hr12) was a heavy diesel-electric locomotive of Valtionrautatiet (Finnish State Railways).

However, due to the high axle weight, the Dr12 had good adhesion properties and it was considered to be a reliable and robust locomotive.

In addition to the underpowered engine, the second problem of the Dr12 was the heavy axle load, which could damage lightly laid tracks.

Dr12 consisted of two three-axle bogies each of which had one driving motor per axle, on which rested a very rigid steel body with the hardware and the cabins.

The locomotive had one large 182-liter 1,800 hp V16 diesel engine mounted in its centre, which was directly connected to the main and auxiliary generator sets.