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A 4-4-6-4, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is one that has four leading wheels followed by four coupled driving wheels, a second set of six coupled driving wheels and four trailing wheels. The Pennsylvania Railroad's Q2 class were the only locomotives ever to use this arrangement.
During the second half of the nineteenth and first half of the twentieth centuries, the 4-6-0 was constructed in large numbers for passenger and mixed traffic service. A natural extension of the 4-4-0 American wheel arrangement, the four-wheel leading bogie gave good stability at speed and allowed a longer boiler to be supported, while the lack of trailing wheels gave a high adhesive weight.
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They were essentially a tender version of the Class 4 2-6-4T, with similar characteristics to the GWR 7800 Class, though unlike the 7800s they were built to the universal loading gauge. They used the same running gear as the tank engine (with the leading bogie from the Standard Class 5), and substantially the same firebox, smokebox and boiler ...
No 4-6-4 tender locomotives saw service in South Africa, but six 4-6-4T tank locomotive classes were used, all of them on 3 ft 6 in (1,067 mm) Cape gauge. In 1896, the Natal Government Railways (NGR) rebuilt one of its Class K&S 4-6-0 tank locomotives to a 4-6-4T configuration, as directed by NGR Locomotive Superintendent George William Reid.
Union Pacific Challenger No. 3985 is an example of a 4-6-6-4 locomotive. In the Whyte notation for classifying steam locomotives by wheel arrangement, a 4-6-6-4 is a railroad steam locomotive that has four leading wheels followed by two sets of six coupled driving wheels and four trailing wheels. 4-6-6-4's are commonly known as Challengers.
Locomotives classified 4-6-0 under the Whyte notation of locomotive axle arrangements. The equivalent UIC classification of locomotive axle arrangements is 2C or 2'C . Contents
The 4-6-4+4-6-4 was the fifth most common Garratt wheel arrangement, with 84 locomotives constructed, 74 by Garratt patent owner Beyer, Peacock & Company between 1936 and 1950 and ten under sub-contract from Beyer, Peacock by Belgian manufacturer Société Franco-Belge in 1952. [1] [2] Only three railway systems used this wheel arrangement.