Co-Bo

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Co-Bo or Co′Bo′ is a

. The "Co" bogie has three driven axles and the "Bo" bogie has two.

The arrangement has been used to even out axle loading. The weight distribution of the locomotive depends on the power unit, the engine and generator. If these are not placed symmetrically, the weight distribution is also biased to one end. Placing three axles beneath the engine end and just two beneath the other, with the lighter ancillaries, gives more even loading per-axle.

Examples

Diesel

British Railways Class 28

The

is the first (and only) locomotive with a Co-Bo wheel arrangement.

C-B

A similar wheel arrangement, with five axles across two bogies, is also used in Japan for the

. The axles of each bogie are all driven, and all geared together, rather than having separate traction motors.

Steam

Some

.

Electric

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

In fiction

.

See also

• Co-Co, has two six-wheeled bogies
  with all axles powered

References