B′B′ locomotives

Wikimedia Commons has media related to B′B′ locomotives.

Locomotives classified B′B′ under the UIC classification of locomotive axle arrangements.

• The nearest comparable AAR wheel arrangement is B-B.
• The equivalent British or Commonwealth classification of locomotive axle arrangements is B-B.

Most of these are diesel-hydraulic locomotives, where the axles of each bogie are coupled. Rarer are the electric transmissions, either electric locomotives or diesel-electric locomotives, where the two axles are coupled by a monomotor bogie rather than the more usual pair of per-axle traction motors.