- 4-8-4 - Wikipedia
Between 1945 and 1947, the Reading Railroad rebuilt thirty of their heavy I-10 class 2-8-0 Consolidations to booster-fitted 4-8-4 Northern locomotives with 70-inch-diameter (1,780 mm) driving wheels
- Union Pacific Big Boy 4-8-8-4 - Hidden Heritage Collections
Photograph of the Union Pacific Big Boy 4-8-8-4 train 132’ 10” in length, 560 tons in weight, 68” driving wheels, and capable of producing 6,360 hp at 42mph
- Big Boy | Steam Engine, Union Pacific, 4-8-8-4 | Britannica
The wheel arrangement was designated 4-8-8-4—i e , a set of 4 pilot wheels led a set of 8 coupled driving wheels, which were compounded by another set of 8 coupled drivers, with 4 trailing wheels
- Union Pacific 4-8-8-4 Big Boy Locomotive - Old Machine Press
The Big Boy utilized a 4-8-8-4 wheel arrangement and was the only locomotive to do so At the front of the engine was a four-wheel leading truck that had 36 in ( 91 m) wheels
- Union Pacific Big Boy Locomotives: Specs, Preserved, Photos
The 4-8-8-4 "Big Boy" was designed by Alco and Union Pacific's Otto Jabelman to handle freight over the Wasatch Mountains Today, several survive
- 4-8-8-4 Big Boy Locomotives in the USA
One could argue that the Big Boys were the largest and maybe they were But the NP Z-5, the DM IR M-3 4, the C O H-8, and the N W Y6b were all examples of the largest of all successful steam locomotives
- 4-8-8-4 — The Bigboy Survivors - John Weeks
The Bigboy is a type 4-8-8-4 locomotive, which means that it has 4 smaller wheels at the front to keep the engine on the tracks, 8 large driver wheels (68 inches in diameter), 8 more large driver wheels, and 4 smaller wheels to hold up the firebox at the back end of the engine
- 4-8-4 - Trains
Under the Whyte notation for the classification of steam locomotives, a 4-8-4 locomotive has four leading wheels arranged in a leading truck, eight coupled driving wheels and four trailing wheels in a trailing truck
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