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1 lip 2024 · Whenever you see a steam locomotive with the same number or fewer of large diameter drive axles than pilot and trailing axles, like this Southern Ry. 4-6-2 Pacific, you’re likely looking at a passenger locomotive, designed for speed over power.
Pacifics that followed the G2 pattern, but increased the cylinder diameter by 1 1/2" (38 mm) and changed the small tube layout in the boiler by substituting 18 2" tubes for 18 of the original 2 1/4". Thus, the boiler had the 175 2 1/4" tubes, 18 2" tubes, and 22 5" flues.
Chesapeake & Ohio 4-6-2 "Pacific" Locomotives in the USA The Chesapeake and Ohio was among the first railroads to test the 4-6-2 wheel arangement (around 1902) and had at least one 4-6-2 before the Missouri Pacific (from which the wheel arrangement gots its name).
There were two classes of 4-6-2 locomotives designed and built under Government auspices; one, the generally called "light", more correctly 4-6-2A, with 55,000 lbs weight per driving axle, and "heavy", 4-6-2B, with 60,000 lbs per driving axle.
Under the Whyte notation for the classification of steam locomotives, 4-6-2 represents the wheel arrangement of four leading wheels on two axles, six powered and coupled driving wheels on three axles and two trailing wheels on one axle.
The Union Pacific 9000 class was the only class of steam locomotives with a 4-12-2 wheel arrangement ever to be built. Under the Whyte notation for the classification of steam locomotives, the locomotives had four leading wheels, twelve coupled driving wheels, and two trailing wheels.
Locomotives with 4 leading wheels, 6 driving wheels and 2 trailing wheels knowns as "Pacific" type locomotives. Community content is available under CC-BY-SA unless otherwise noted.
