Geared steam locomotive
A geared steam locomotive is a type of steam locomotive which uses gearing, usually reduction gearing, in the drivetrain, as opposed to the common directly driven design.
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.