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  2. 4-8-4+4-8-4 - Wikipedia

    en.wikipedia.org/wiki/4-8-4+4-8-4

    There were only two classes of 4-8-4+4-8-4 steam locomotives worldwide, all of which were constructed by Beyer, Peacock & Company, the owners of the Garratt patent. [1]The predecessor 4-8-2+2-8-4 Double Mountain was likely the optimal Garratt wheel arrangement, with the four-wheeled leading bogies and the two-wheeled trailing trucks on each engine unit ensuring stability at speed and with ...

  3. 4-8-4 - Wikipedia

    en.wikipedia.org/wiki/4-8-4

    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 ...

  4. 4-8-8-4 - Wikipedia

    en.wikipedia.org/wiki/4-8-8-4

    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.

  5. Iron pipe size - Wikipedia

    en.wikipedia.org/wiki/Iron_pipe_size

    The iron pipe size standard came into being early in the 19th century and remained in effect until after World War II. The IPS system was primarily used in the United States and the United Kingdom. In the 1920s, the Copper Tube Size (CTS) standard was combined with the IPS standard.

  6. 4-8-0 - Wikipedia

    en.wikipedia.org/wiki/4-8-0

    The nickname Mastodon is often mistakenly used to describe the 4-8-0 wheel arrangement and was derived from the unofficial name of the first 4-8-0 locomotive of the Central Pacific Railroad in the United States, the wood-fired CPR no. 229, which was designed and built in 1882 by the railroad's master mechanic, Andrew Jackson (A.J.) Stevens, at ...

  7. 4-8-0+0-8-4 - Wikipedia

    en.wikipedia.org/wiki/4-8-0+0-8-4

    All the 4-8-0+0-8-4 Garratts were built by Beyer, Peacock & Company for the 5 ft 6 in (1,676 mm) gauge Bengal Nagpur Railway in India. The first 16 were designated Class N and were delivered in 1929, while 10 more arrived in 1931 and were designated class NM. The locomotives had Belpaire fireboxes and piston valves. [1]

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