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.
Steam locomotives of British Railways
Former main line locomotives, along with various smaller industrial shunters, form the backbone of steam motive power for heritage railways. Main line running on charter trains is possible and they run under TOPS code as Class 98.