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UIC loading gauges. The International Union of Railways (UIC) has developed a standard series of loading gauges named A, B, B+ and C. PPI – the predecessor of the UIC gauges had the maximum dimensions 3.15 by 4.28 m (10 ft 4 in by 14 ft 1 in) with an almost round roof top. UIC A: The smallest (slightly larger than PPI gauge). [5]
As shown on the photographs at right, the code may be arranged either vertically (e.g. on closed wagons) on three or more lines at man's height with the letter codes next to the corresponding part of the digit code, or horizontally (e.g. on flat wagons) at the bottom of the chassis side with all digits together (with groups separated by spaces and the check digit by a dash) and all letters ...
In France, the UIC classification is used for diesels and electrics while a scheme similar to the Whyte notation, but counting axles instead of wheels, is used for steam locomotives. Notably, Switzerland had its own separate notation system until 1989, with the Swiss locomotive and railcar classification now only retained for its narrow gauge ...
The UIC uses the following structure: [4] Upper-case letters Indicate driving axles, starting at A for a single axle. B thus indicates two and C indicates three consecutive pairs of driving wheels. Lower-case "o" Related to driving axles (minimum 2, "B"), indicates they are individually driven by separate traction motors. Numbers
Bo′Bo′ (UIC) or Bo-Bo (Commonwealth) 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 .
The official name of this gauge is the Gabarit passe-partout international (PPI, literally "pass-everywhere international gauge"), and it came into force in 1914. The European (Berne) loading gauge is usually 3,150 mm (10 ft 4 in) wide by 3,175 mm (10 ft 5.0 in) rising to 4,280 mm (14 ft 1 in) in the centre.
The international system for the classification of goods wagons was agreed by the Union internationale des chemins de fer (UIC) in 1965 and subsequently introduced into member countries. For example it was adopted in Germany on 1 January 1968 replacing the previous German railway wagon classes that originated as early as 1905.
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