McCloud River 2-6-2 "Prairie" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 10 (Locobase 12488)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 23, p. 249 Works number was 18674 in February 1901.

Fitted with a slightly larger boiler than the the 8-9 that preceded it (Locobase 12459), the 10 served the McCloud for more than 3 decades. In June 1935, the 10 went to the Yreka Western, where it operated until scrapped in 1944.

Class 20 (Locobase 15310)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 73, p. 311. Works numbers were 57617-57618 in January 1924.

These superheated oil-burning logging Prairies had a useful amount of superheater area. Their cylinders were served by 9 1/2 in (241 mm) piston valves.

The pair served the McCRR for over thirty years before being retired. They were sold for scrap on 23 November 1955. McCRR Prairies 22-23 were Alcos delivered in 1925 with the same power dimensions and engine weight.

Class 8 (Locobase 12466)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 23, p. 186. See for information on the railroad. Works numbers were 18595-18596 in January 1901.

Logging railroads such as the McCloud River needed locomotives with several axles to spread the weight over lightly built right of way. Thus the Prairie arrangement, often seen as an express passenger layout, appeared on dozens of logging engines. The Baldwin specs for this pair noted that they were to face ruling grades of 4% and curves of 383-ft (10-deg) curvature.

The 8 remained with the McCloud River until January 1939, when it was sold to the Amador Central as their #7. The 9 went to the Yreka Railroad (later the Yreka Western) in 1930. It joined the 7 on the AC in January 1940. Tom Correa sent an email to in December 2012 telling us that the 7's nickname on the AC was "Iron Ivan".

Gene Connelly's list shows that Iron Ivan remained on the AC until December 1960, when it was donated to the California Chamber of Commerce, which put it on display outside of a police station.

9 took a different route, leaving the AC in April 1944 to work for the Nezperce & Idaho, a Lewiston, Ida based shortline that began as the Lewiston, Nezperce & Eastern in 1908 and was reorganized as the N&I in 1917. Its main line linked Craigmont to Nezperce 13.4 miles (21.6 km) away. (See "It's a short line, but a long story" published originally in the Lewiston Morning Tribune in 1961 and archived at . and Dan Butler "Railroads of the Camas Prairie,"The Pacific Northwest Forum

Volume 8, Numbers 2-3 (Spring-Summer, 1983), Pages 39-48), archived at

The Nezperce sold the 9 to Richard Hinebaugh in January 1966, who included it on the roster of the Kettle Moraine Railway in North Lake, Wisconsin. Known as the Sequoia, , the 9 operated until it boiler ran out of time in 2001. The 9 was donated to the National Railroad Museum in Green Bay, Wisc. in 2003.

Specifications by Steve Llanso of Sweat House Media
Locobase ID12488 15310 12466
RailroadMcCloud RiverMcCloud RiverMcCloud River
Number in Class112
Road Numbers1020-218-9
Number Built112
BuilderBurnham, Williams & CoBaldwinBurnham, Williams & Co
Valve GearStephensonWalschaertStephenson
Locomotive Length and Weight
Driver Wheelbase 7.67' 9.50' 7.67'
Engine Wheelbase23.83'24.83'23.83'
Ratio of driving wheelbase to overall engine wheebase 0.32 0.38 0.32
Overall Wheelbase (engine & tender)47.54'52.48'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers82000 lbs106000 lbs82000 lbs
Engine Weight107000 lbs132000 lbs107000 lbs
Tender Light Weight50000 lbs86000 lbs50000 lbs
Total Engine and Tender Weight157000 lbs218000 lbs157000 lbs
Tender Water Capacity2500 gals4000 gals2500 gals
Tender Fuel Capacity (oil/coal)1800 gals gals
Minimum weight of rail (calculated)46 lb/yard59 lb/yard46 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter44"46"44"
Boiler Pressure160 psi185 psi160 psi
Cylinders (dia x stroke)16" x 24"17" x 24"16" x 24"
Tractive Effort18991 lbs23711 lbs18991 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.32 4.47 4.32
Heating Ability
Firebox Area122.70 sq. ft104 sq. ft114 sq. ft
Grate Area16 sq. ft21 sq. ft16 sq. ft
Evaporative Heating Surface1562 sq. ft1342 sq. ft1499 sq. ft
Superheating Surface292 sq. ft
Combined Heating Surface1562 sq. ft1634 sq. ft1499 sq. ft
Evaporative Heating Surface/Cylinder Volume279.68212.85268.39
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation256038852560
Same as above plus superheater percentage256045842560
Same as above but substitute firebox area for grate area196322270318240
Power L14570101004347
Power MT368.60630.19350.62

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