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Bo-Bo
Bo-Bo (Commonwealth), Bo′Bo′ (UIC), or B-B (AAR) is a wheel arrangement classification for railway locomotives with four powered axles mounted in two bogies. Each bogie has two axles, both of which are powered. This configuration is one of the most common arrangements for modern electric and diesel locomotives.
Bo-Bo (Commonwealth), B-B (AAR), and Bo′Bo′ (UIC) is the 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.
Due to the advent of modern motors and electronics more power can be brought to the rail with only a few axles. Modern electric locomotives can deliver up to 6400 kW on only four axles. For very heavy loads, especially in transportation of bulk goods, a single unit with this wheel arrangement tends to have too little adhesive weight to accelerate the train sufficiently fast without wheelslip.
The Bo+Bo locomotive has its two bogies directly coupled to one another, so that the tractive force of the leading bogie is transmitted to the drawgear via the trailing bogie instead of via the locomotive body. In the United Kingdom, this arrangement was used for the British Rail Class 76 electric locomotives, the first of which was built in 1941.
Eighteen of the Japanese 3 ft 6 in (1,067 mm) narrow-gauge Bo-Bo electric JNR Class ED61 were rebuilt in the late 1970s to form the Class ED62. An additional carrying axle was added between the bogies to give a B-1-B (AAR) or Bo′1Bo′ (UIC) arrangement. The intention was to give a lighter axle loading for the Iida Line.
Another rare arrangement was the Bo-2-Bo used for two 3 ft 6 in (1,067 mm) gauge Japanese electric classes, the ED76 and ED78. These used flexicoil outer bogies which permitted the bogies some lateral movement, as well as swivelling.
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Bo-Bo
Bo-Bo (Commonwealth), Bo′Bo′ (UIC), or B-B (AAR) is a wheel arrangement classification for railway locomotives with four powered axles mounted in two bogies. Each bogie has two axles, both of which are powered. This configuration is one of the most common arrangements for modern electric and diesel locomotives.
Bo-Bo (Commonwealth), B-B (AAR), and Bo′Bo′ (UIC) is the 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.
Due to the advent of modern motors and electronics more power can be brought to the rail with only a few axles. Modern electric locomotives can deliver up to 6400 kW on only four axles. For very heavy loads, especially in transportation of bulk goods, a single unit with this wheel arrangement tends to have too little adhesive weight to accelerate the train sufficiently fast without wheelslip.
The Bo+Bo locomotive has its two bogies directly coupled to one another, so that the tractive force of the leading bogie is transmitted to the drawgear via the trailing bogie instead of via the locomotive body. In the United Kingdom, this arrangement was used for the British Rail Class 76 electric locomotives, the first of which was built in 1941.
Eighteen of the Japanese 3 ft 6 in (1,067 mm) narrow-gauge Bo-Bo electric JNR Class ED61 were rebuilt in the late 1970s to form the Class ED62. An additional carrying axle was added between the bogies to give a B-1-B (AAR) or Bo′1Bo′ (UIC) arrangement. The intention was to give a lighter axle loading for the Iida Line.
Another rare arrangement was the Bo-2-Bo used for two 3 ft 6 in (1,067 mm) gauge Japanese electric classes, the ED76 and ED78. These used flexicoil outer bogies which permitted the bogies some lateral movement, as well as swivelling.