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Bo-Bo

B-B and Bo-Bo are the AAR and UIC classifications of wheel arrangement for railway locomotives with four axles in two individual bogies. It is a common wheel arrangement for modern electric and diesel locomotives.

Bo-Bo

Bo-Bo is the UIC indication of a wheel arrangement for railway vehicles with four axles in two individual bogies, all driven by their own traction motors. It is a common wheel arrangement for modern electric and diesel-electric locomotives, as well as power cars in electric multiple units.

Most early electric locomotives shared commonalities with the steam engines of their time. These features included side rods and frame mounted driving axles with leading and trailing axles. The long rigid wheelbase and the leading and trailing axles reduced cornering stability and increased weight.

The Bo-Bo configuration allowed for higher cornering speeds due to the smaller rigid wheelbase. Furthermore it allowed better adhesion because all the wheels were now powered. Due to the absence of frame mounted wheels no leading or trailing axles were necessary to aid cornering, reducing weight and maintenance requirements.

Bo+Bo

A Bo+Bo (UK usage) is a locomotive with two four-wheeled bogies with articulated connection between them and with all axles powered by individual traction motors.

Typical Bo+Bo locomotives include the South African Class 1E and South African Class 2E.

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