2-10-10-2
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:
- Swiss classification)
- Italian and French classification: 150+051
- Turkish classification: 56+56
- Swiss classification: 5/6+5/6
The equivalent
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. None survive today. 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 were preserved.
ATSF 3000 class
| ATSF 3000 class | |
|---|---|
ATSF | |
| Rebuild date | 1915-1918 (as 2-10-2’s) |
| Number rebuilt | 10 |
| Specifications | |
|---|---|
| Driver dia. | 57 in (1.448 m) |
| Wheelbase | 108 ft 10 in (33.17 m) |
| Length | 122 ft (37.19 m) |
| Loco weight | 616,000 lb (279,400 kg; 279.4 t) |
| Tender weight | 266,400 lb (120,800 kg; 120.8 t) |
| Total weight | 882,400 lb (400,180 kg; 400.18 t) |
| Boiler pressure | 225 psi (1.55 MPa) |
| Cylinders | Four, compound (LP front, HP rear) |
| High-pressure cylinder | 28 in × 32 in (711 mm × 813 mm) |
| Low-pressure cylinder | 38 in × 32 in (965 mm × 813 mm) |
| Performance figures | |
|---|---|
| Tractive effort | 111,600 lbf (496 kN) |
| Career | |
|---|---|
| Operators | Atchison, Topeka and Santa Fe Railway |
| Numbers | 3000–3009 |
| Withdrawn | 1945-1953 |
| Scrapped | 1947-1953 |
| Disposition | 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 (16 to 24 km/h) before losing steam. The ATSF returned them to their 2-10-2 configurations between 1915 and 1918.
Virginian Railway class AE
| Virginian Class AE | ||
|---|---|---|
Factor of adh. | 4.19 | |
| Career | |
|---|---|
| Operators | Virginian |
| Number in class | 10 |
| Numbers | 800-809 |
| Disposition | All scrapped from 1943-1953 |
These ten locomotives were built in 1918 by
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 (66,800 kg) in compound, or 176,600 lb (80,100 kg) in simple for the Virginian locomotives.[2]
The class remained in service until the 1940s. No examples have been preserved.[1]
References
- ^ a b c Bruce, Alfred. The Steam Locomotive in America: Its Development in the Twentieth Century. New York: W.W. Norton. pp. 321, photo 85.
- ISBN 1-883089-05-0.
External links
