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 locomotives, as well as driving cars in 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.

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  • Uma locomotiva Bo-Bo (uso britânico) ou Bo'Bo', na Classificação UIC significa que a locomotiva tem dois truques totalmente independentes com quatro rodas e com os eixos tracionados por motores. As locomotivas Bo-Bo são bastante usadas em trens de passageiros expressos ou locomotivas de tamanho pequeno e médio. Também são usadas em locomotivas que trafegam em linhas com curvas mais fechadas no Brasil. Tipicamente as locomotivas Bo-Bo EMD G12, GE U12 e classe EMD G22U. Classificações similares: Classificação AAR: B-B Classificação Suíça: 4/4
  • “Bo-Bo”或“Bo'Bo'”，是國際鐵路聯盟（UIC）定義的鐵路機車車輛軸式之一，每輛機車擁有兩副轉向架，每轉向架擁有兩軸，每軸由一台獨立的牽引電動機驅動。這種軸式常見於快速客運機車上。 例子有西門子製造的EuroSprinter車系、日本的DD/ED型、中國的韶山8型等。
  • 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 locomotives, as well as driving cars in 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. In AAR notation a Bo-Bo is regarded as a B-B because the AAR system does not take traction motors into consideration, only powered axles. An AAR like notation is used in France too, making it hard to tell the B-B and Bo-Bo engines apart, both of which are common there.
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  • Uma locomotiva Bo-Bo (uso britânico) ou Bo'Bo', na Classificação UIC significa que a locomotiva tem dois truques totalmente independentes com quatro rodas e com os eixos tracionados por motores. As locomotivas Bo-Bo são bastante usadas em trens de passageiros expressos ou locomotivas de tamanho pequeno e médio. Também são usadas em locomotivas que trafegam em linhas com curvas mais fechadas no Brasil. Tipicamente as locomotivas Bo-Bo EMD G12, GE U12 e classe EMD G22U.
  • “Bo-Bo”或“Bo'Bo'”，是國際鐵路聯盟（UIC）定義的鐵路機車車輛軸式之一，每輛機車擁有兩副轉向架，每轉向架擁有兩軸，每軸由一台獨立的牽引電動機驅動。這種軸式常見於快速客運機車上。 例子有西門子製造的EuroSprinter車系、日本的DD/ED型、中國的韶山8型等。
  • 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 locomotives, as well as driving cars in 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.
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  • Bo-Bo
  • Bo-Bo
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