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

    en.wikipedia.org/wiki/2-8-8-8-4

    2-8-8-8-4. Under the Whyte notation for the classification of steam locomotives, a 2-8-8-8-4 has two leading wheels, three sets of eight driving wheels, and four trailing wheels. The equivalent UIC classification is to be refined to (1'D)D (D2') for these engines. Only one 2-8-8-8-4 was ever built, a Mallet -type for the Virginian Railway in ...

  3. 2-8-8-4 - Wikipedia

    en.wikipedia.org/wiki/2-8-8-4

    The Northern Pacific Railway was the first railroad to order a 2-8-8-4. The first was built in 1928 by American Locomotive Company; at the time, it was the largest locomotive ever built. It had the largest firebox ever applied to a steam locomotive, some 182 square feet (16.9 m 2) in area, to burn Rosebud coal, a cheap low-quality coal.

  4. Northern Pacific Railway locomotives - Wikipedia

    en.wikipedia.org/wiki/Northern_Pacific_Railway...

    The 2-8-8-4 was first built for the Northern Pacific Railway in 1928. The 4-6-6-4 locomotives were so large that in many places in Montana the Northern Pacific had to widen the centers of its double track on the Rocky Mountain Division. As a rule they did not work west of Easton, Washington, due to the confines of Stampede Tunnel under the ...

  5. 2-8-4 - Wikipedia

    en.wikipedia.org/wiki/2-8-4

    Under the Whyte notation, a 2-8-4 is a steam locomotive that has two unpowered leading wheels, followed by eight coupled and powered driving wheels, and four trailing wheels. This locomotive type is most often referred to as a Berkshire, though the Chesapeake and Ohio Railway used the name Kanawha for their 2-8-4s.

  6. Southern Pacific class AC-9 - Wikipedia

    en.wikipedia.org/wiki/Southern_Pacific_class_AC-9

    Water cap. The AC-9 was one of two Southern Pacific Railroad 's articulated steam locomotive classes that ran smokebox forward after 1920. Twelve AC-9 class locomotives were built by Lima in 1939 and were Southern Pacific's largest and heaviest steam engines, partly a consequence of low quality coal these engines were designed to burn.

  7. Triplex locomotive - Wikipedia

    en.wikipedia.org/wiki/Triplex_locomotive

    The Erie Matt H. Shay 2-8-8-8-2 Baldwin Erie P1 5016 Triplex - Shown in Exeter, PA The only 2-8-8-8-4 triplex locomotive ever built. A triplex locomotive was a steam locomotive that divided the driving force on its wheels by using three pairs of cylinders to drive three sets of driving wheels. Any such locomotive will inevitably be articulated.

  8. 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 ...

  9. Norfolk and Western J class (1941) - Wikipedia

    en.wikipedia.org/wiki/Norfolk_and_Western_J...

    The Norfolk and Western J class was a class of 14 4-8-4 "Northern" streamlined steam locomotives built by the Norfolk and Western Railway (N&W) at its Roanoke Shops in Roanoke, Virginia, between 1941 and 1950. The most powerful 4-8-4 locomotives ever produced, the J class were part of the N&W's "Big Three" (along with the class A and Y6 freight ...