Co-Bo

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Preserved No. D5705, a British Rail Class 28 Co-Bo locomotive
Preserved No. D5705, a British Rail Class 28 Co-Bo locomotive

In the UIC classification, the Co-Bo wheel arrangement features two uncoupled bogies. The "Co" bogie has three driven axles and the "Bo" bogie has two.

The British Rail Class 28 is the only UK locomotive with a Co-Bo wheel arrangement. Other examples worldwide include the class DE10 and DE11 diesel-hydraulic locomotives in Japan.

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.

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