Geared steam locomotive
This gearing is part of the machinery within the locomotive and should not be confused with the pinion that propels a rack locomotive along the rack between the rails. The geared steam locomotives that have been built have been for conventional track, relying on the adhesion between wheels and rail.
Brienz Rothorn Railway
All steam locomotives are Class H2/3, indicating that 2 axles of the 3 are driven, giving a wheel arrangement (Whyte System) of 0-4-2. The older locomotives are a side tank, "kneeling cow" design of a standard SLM product. The modern steam locomotives use an efficient "light oil" fired steam technology and were built by SLM (former Swiss Locomotive and Machine Works) of Winterthur.