2-10-10-2

Mallet locomotive wheel arrangement Under the Whyte notation for the classification of steam locomotive wheel arrangements, a 2-10-10-2 is a locomotive with two leading wheels, two sets of ten driving wheels, and a pair of trailing wheels. Other equivalent classifications are: UIC classification: 1EE1 (also known as German classification and Swiss classification) Italian and French classification: 150+051 Turkish classification: 56+56 Swiss classification: 5/6+5/6 The equivalent UIC classification is refined to (1′E)E1′ for Mallet locomotives. All 2-10-10-2 locomotives have been articulated locomotives of the Mallet type. This wheel arrangement was rare. Only two classes of 2-10-10-2 locomotives have been built: the Atchison, Topeka and Santa Fe Railway's 3000 class, and the Virginian Railway's class AE. The 3000 class performed poorly, so the railroad returned them to their original 2-10-2 configuration after no more than seven years of service. The class AE locomotives were much more successful, providing between 25 and 31 years of service; some were scrapped between 1943 and 1945, and the rest were scrapped between 1947 and 1949. None of either class were preserved. ATSF 3000 class July 2024 ATSF 3000 class ATSF 3000 class Detroit Publishing - New Mallet articulated compound engine on the Santa Fe (sky cropped).jpg ATSF 3000 class 2-10-10-2. The forward section of the boiler is a primitive superheater and feedwater heater Steam Baldwin Locomotive Works 1911-1912 ATSF 1915-1918 (as 2-10-2’s) 10 2-10-10-2 ussg 57 in m 3 on 108 ft 10 in m on 122 ft m 2 on 616,000 lb kg t 4 on 266,400 lb kg t on 882,400 lb (400,180 kg; 400.18 t) 225 psi MPa on Four, compound (LP front, HP rear) 28 x 32 in mm 0 on 38 x 32 in mm 0 on 111600 lbf kN on Atchison, Topeka and Santa Fe Railway 3000–3009 1945-1953 1947-1953 All scrapped In 1911 and 1912, the Atchison, Topeka and Santa Fe Railway modified ten 2-10-2 Baldwin-built locomotives into a new 2-10-10-2 configuration dubbed the 3000 class. They were the largest locomotives in the world from their introduction until 1914. They performed well in helper service, but could only go 10 to 15 mph before losing steam. The ATSF reverted them to their 2-10-2 configurations between 1915 and 1918. Virginian Railway class AE section August 2024 Virginian Railway class AE Virginian Class AE Steam American Locomotive Company 1227 Virginian Railway AE.jpg Virginian Class AE Reference: 1918 10 2-10-10-2 ussg 56 in mm 0 on 64.25 ft m on 617000 lb kg t 0 on 684000 lb kg t 0 on 214300 lb kg t 0 on 898300 lb kg t 0 on Coal 13000 USgal impgal L 0 on 12 ST LT t 1 118.5 in mm 0 on 215 psi MPa 0 on 108.7 sqft m2 0 on 8528 sqft m2 0 on 5580 sqft m2 0 on 438 sqft m2 0 on 2510 sqft m2 0 on 2120 sqft m2 0 on Four, compound (LP front, HP rear) 48 x 32 in mm 0 on Walschaerts 30 x 32 in mm 0 on Compound: 147200 lbf kN 0 onSimple: 176600 lbf kN 0 on 4.19 Air Air 10 800-809 Virginian All scrapped from 1943-1953 12.0 ft m 3 on 16.625 ft m 3 on These ten locomotives were built in 1918 by ALCO for the Virginian Railway. With a width of 12 ft mm 0, they were delivered without their cabs and front low-pressure cylinders and were assembled after delivery. The 48 in mm 0 on low-pressure cylinders (on 90 in mm 0 on or centers) were the largest on any U.S. locomotive; these had to be inclined a few degrees to provide clearance. The boiler was also the widest of any locomotive; Railway Mechanical Engineer says "the outside diameter of the largest course is 112+7/8 in mm 0." but the drawing shows 118+1/2 in mm 0 diameter at the rear tube sheet. Their accompanying fuel tenders were shorter than usual so the locomotive would fit on the Virginian's turntables. This class were compound Mallet locomotives. The rear, high-pressure cylinders exhausted their steam into the huge front cylinders. They could also be operated in simple mode for starting; reduced-pressure steam could be sent straight from the boiler to the front cylinders at low speed, for maximum tractive effort. The calculated tractive effort was 147,200 lb kg on in compound, or 176,600 lb kg on in simple for the Virginian locomotives.Lewis Lloyd D. Virginian Railway Locomotives 1993 Walsworth Publishing Co. Marceline, Missouri 1-883089-05-0 32 1 The class remained in service until the 1940s. No examples have been preserved. References Bruce Alfred The Steam Locomotive in America: Its Development in the Twentieth Century W.W. Norton New York 321, photo 85 left 1010,2-10-10-2 3000 AE Category:Steam locomotives of the United States Category:Railway locomotives introduced in 1911