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2. Union Pacific Big Boy - Wikipedia

   en.wikipedia.org/wiki/Union_Pacific_Big_Boy

   Cost to build US$ 265,000 in 1941, equivalent to $5,489,457 in 2023. 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. The 25 Big Boy locomotives were built to ...

3. Union Pacific FEF series - Wikipedia

   en.wikipedia.org/wiki/Union_Pacific_FEF_series

   Factor of adh. The Union Pacific FEF series consists of 45 4-8-4 "Northern" steam locomotives built by the American Locomotive Company (ALCO) between 1937 and 1944 and operated by the Union Pacific Railroad until 1959. Like other Union Pacific steam classes, the acronym comes from the first letter of the spelling of its wheel arrangement: Four ...

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

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

   4-8-4+4-8-4. Under the Whyte notation for the classification of steam locomotives by wheel arrangement, the 4-8-4+4-8-4 is a Garratt locomotive. The wheel arrangement is effectively two 4-8-4 locomotives operating back to back, with the boiler and cab suspended between the two engine units. Each engine unit has two pairs of leading wheels in a ...

5. 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 ...

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7. New York Central Niagara - Wikipedia

   en.wikipedia.org/wiki/New_York_Central_Niagara

   The New York Central Railroad's Niagara was a class of 27 4-8-4 steam locomotives built by the American Locomotive Company for the New York Central Railroad. Like many railroads that adopted different names for their 4-8-4s rather than “Northerns”, the New York Central named them “Niagaras”, after the Niagara River and Falls.