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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 ...
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 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 allowed greater production of steam. The four-wheel ...
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 the other Union Pacific steam classes, the acronym comes from the first letter of the spelling of its wheel arrangement: Four Eight Four.
The later ones had cylinders 24 inches by 32 inches, drivers 63-1/2 inches and boiler pressures of 250 psi, giving a calculated tractive effort of 123,400 lb. [1] The locomotives were built as cab-forwards to protect engine crews from exhaust smoke and heat in the many tunnels and snow sheds that were part of their usual routes. [ 1 ]
A 2-8-8-4 steam locomotive, under the Whyte notation, has two leading wheels, two sets of eight driving wheels, and a four-wheel trailing truck. The type was generally named the Yellowstone , a name given it by the first owner, the Northern Pacific Railway , whose lines ran near Yellowstone National Park .
Only one 2-8-8-8-4 was ever built, a Mallet-type for the Virginian Railway in 1916. [1] Built by Baldwin Locomotive Works, it became the only example of their class XA, so named due to the experimental nature of the locomotive. Like the same railroad's large articulated electrics and the Erie Railroad 2-8-8-8-2s, it was nicknamed "Triplex".
The cylinder casting includes other features such as (in the case of Stephenson's Rocket) valve ports and mounting feet. [1] The last big American locomotives incorporated the cylinders as part of huge one-piece steel castings that were the main frame of the locomotive. [ 2 ]
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