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.
Climax locomotive
In 1893 Scott proposed a geared steam locomotive, in which the frame of the boiler was hinged to the frame of the tender. The running gear underneath the boiler was firmly connected to it and was driven by common lateral cylinders and side rods. Underneath the tender was a truck which was similar to the Climax locomotives driven by a central shaft which took the power from the front axle of the locomotive via a hypoid bevel gear. For the first time, the design used closed axle drives with housings on one hand protecting the gear unit from and on the other hand also containing the gear lubricant.