Co-Bo

Co-Bo or Co′Bo′ is a wheel arrangement in the UIC classification system for railway locomotives.

A similar wheel arrangement, with five axles across two bogies, is also used in Japan for the Class DE10, DE11, and DE15 locomotives.

A hydrodynamic transmission on the locomotive frame is driven by the prime mover, then drive to each bogie is taken by cardan shafts.

Some Engerth steam locomotives were built to the Fink system, with the four trailing wheels driven by a crankshaft and connecting rods, thus making them 0-6-4-0Ts instead of 0-6-4Ts.

The Hungarian Railways Class V55 [hu] also used a Co'Bo' wheel arrangement with three-phase slip-ring motors driving each axle.

Japanese DE10 C-B class
British Railways Class 28
DE 10 class
V55 preserved in the Hungarian Railway History Park