Bo-Bo
Encyclopedia
A Bo-Bo or Bo′Bo′ (UIC notation) is a locomotive
Locomotive
A locomotive is a railway vehicle that provides the motive power for a train. The word originates from the Latin loco – "from a place", ablative of locus, "place" + Medieval Latin motivus, "causing motion", and is a shortened form of the term locomotive engine, first used in the early 19th...

 with two independent four-wheeled bogie
Bogie
A bogie is a wheeled wagon or trolley. In mechanics terms, a bogie is a chassis or framework carrying wheels, attached to a vehicle. It can be fixed in place, as on a cargo truck, mounted on a swivel, as on a railway carriage/car or locomotive, or sprung as in the suspension of a caterpillar...

s with all axles powered by individual traction motor
Traction motor
Traction motor refers to an electric motor providing the primary rotational torque of a machine, usually for conversion into linear motion ....

s (cf B-B). Bo-Bos are mostly suited to express passenger or medium-sized locomotives.

Typical Bo-Bo locomotives include DB Class 120
DB Class 120
The DB Baureihe 120 is a class of electric locomotives operated by DB Fernverkehr in Germany.-Background and design:The locomotives' prototypes, delivered in 1979 , were one of the first electric locomotives with three-phase motors. They were based on experiences made in the 1970s with...

, FS Class E464
FS Class E464
The E464 is a class of Italian railways electric locomotives. They were introduced in the course of the 1990s for hauling light trains, especially for commuter service. They were acquired by FS Trenitalia to replace the old E424 and E646, dating from the 1940s and 1950s...

 and SJ Class Rc.

In AAR notation
AAR wheel arrangement
The AAR wheel arrangement system is a method of classifying locomotive wheel arrangements that was developed by the Association of American Railroads. It is essentially a simplification of the European UIC classification, and it is widely used in North America to describe diesel and electric...

 a Bo-Bo is regarded as a B-B because the AAR system does not take traction motors into consideration, only powered axles.
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