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Union Pacific 844, the only steam locomotive never retired by a North American Class I railroad. The 4-8-4 wheel arrangement was a progression from the 4-8-2 Mountain type and, like the 2-8-4 Berkshire and 4-6-4 Hudson types, an example of the "Super Power" concept in steam locomotive design that made use of the larger firebox that could be supported by a four-wheel trailing truck, which ...
A Big Boy locomotive.This example is Union Pacific 4014. 4-8-8-4 wheel arrangement. A 4-8-8-4 in the Whyte notation for the classification of steam locomotives by wheel arrangement, is a locomotive with a four-wheel leading truck, two sets of eight driving wheels, and a four-wheel trailing truck.
A transfer table contains two tracks with different configurations. The table is moved sideways or rotated [3] to choose the configuration that connects the track that the incoming train will be traveling from and to. Using transfer table as a switch or a rotary switch allows the center rack rail to be aligned for the cog wheels to continually ...
The Union Pacific Big Boy is a type of simple articulated 4-8-8-4 steam locomotive manufactured by the American Locomotive Company (ALCO) between 1941 and 1944 and operated by the Union Pacific Railroad in revenue service until 1962.
4 ft 8 in gauge railways are railways with a track gauge of 4 ft 8 in / 1,422 mm. This gauge is 1 ⁄ 2 inch (13 mm) less than 4 ft 8 + 1 ⁄ 2 in ( 1,435 mm ) standard gauge The first such railways were the Killingworth Railway [ 1 ] [ 2 ] and the Stockton and Darlington Railway [ note 1 ]
The main reason for the domestic scales different from international standards is the smaller prototype loading gauge and unusual gauges of Japanese railways: 600 mm (1 ft 11 + 5 ⁄ 8 in), 762 mm (2 ft 6 in) and 1,067 mm (3 ft 6 in) are used, along with standard gauge of 1,435 mm (4 ft 8 + 1 ⁄ 2 in).