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(For greater speeds, the Union Pacific Railroad chose a four-wheel leading truck and drivers of 68 inches (1.73 m) for its Big Boy 4-8-8-4 class.) Several classes of Yellowstone, especially the Duluth, Missabe and Iron Range's locomotives, are among the largest steam locomotives, with the exact ranking depending on the criteria used.
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 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 haul freight over the Wasatch Range between Ogden, Utah, and Green ...
The Quadruplex was to comprise three articulated engines of 8 driving wheels each beneath the locomotive itself, and a fourth engine beneath the tender.As a compound locomotive, engine cylinders 7 and 9 (as numbered on the above image) would receive high pressure steam to drive the first and third engines, each would exhaust as low-pressure steam to power cylinders 8 and 10 on the second and ...
Between 1951 and 1956, 78 Class D60 2-8-4 locomotives were rebuilt from Class D50 at the JNR's Hamamatsu, Nagano and Tsuchizaki Works. In 1959 and 1960, six Class D61 2-8-4 locomotives were rebuilt from Class D51 at the JNR's Hamamatsu and Kōriyama Works. Some of these locomotives survived in service up to the end of steam traction on the JNR ...
Union Pacific 4014 is a preserved 4884-1 class 4-8-8-4 "Big Boy" type steam locomotive owned and operated by the Union Pacific (UP) as part of its heritage fleet.Built in November 1941 by the American Locomotive Company (ALCO) at its Schenectady Locomotive Works, it was assigned to haul heavy freight trains in the Wasatch mountain range.
Both of the Northern Pacific's 2-6-6-2 classes were copies of GN designs, including their Belpaire fireboxes, a rarity on NP steam locomotives. NP 3015, last of the Class Z's, had a troubled existence, suffering a crown sheet failure at Kennedy, Washington , on Stampede Pass circa 1916, then later derailing on the Wallace Branch in Idaho in 1933.
The design drew on recent experience with the enormous 4-8-8-4 Big Boy locomotives, and resulted in a locomotive in that in working order weighed some 317 short tons (288 t; 283 long tons) accompanied by a tender that weighed 174 short tons (158 t; 155 long tons) when two-thirds loaded. Calculated tractive effort is 97,350 lbf (433.0 kN).