The SRwy superheated most of its engines, even the small logging Prairies that roamed the back country of the Sierra Nevada. The 30 had to tread lightly: it rolled on 40 lb/yard (20 kg/metre) rail, up 4% grades, and contorted its trains around 45 degree curves.
After 15 years with the SRR, the 30 was sold in March 1937 to Howard Terminal in Oakland, Calif, and converted to a 2-6-2T.
Unusual Prairie that operated in the California mountains on this logging railroad's Angels Camp branch. Its piston valves measured 8" (203 mm) in diameter.
In 1940, the Western Pacific bought the little mountaineer to operate on its Tidewater Southern subsidiary; at that point, the tender's capacities had increased to 3,760 US gallons (14,232 litres) and 1,500 gallons (5,678 litres) of oil and weighed 78,526 lb (35,619 kg). The Tidewater Southern website -- http://www.tidewatersouthern.com/contents/motivepower/steam/Baldwin_2-6-2_132/baldwin_2-6-2_132.htm, accessed 3 July 2006, believes the 132 was the last steamer to operate in revenue service on the WP's lines.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Sierra Railway||Sierra Railway|
|Number in Class||1||1|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.39||0.37|
|Overall Wheelbase (engine & tender)||46.21'||46.96'|
|Axle Loading (Maximum Weight per Axle)||27700 lbs|
|Weight on Drivers||78000 lbs||83100 lbs|
|Engine Weight||98000 lbs||106200 lbs|
|Tender Light Weight||63100 lbs||63000 lbs|
|Total Engine and Tender Weight||161100 lbs||169200 lbs|
|Tender Water Capacity||3000 gals||3000 gals|
|Tender Fuel Capacity (oil/coal)||1000 gals||1000 gals|
|Minimum weight of rail (calculated)||43 lb/yard||46 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||175 psi||180 psi|
|Cylinders (dia x stroke)||15" x 24"||16" x 24"|
|Tractive Effort||19125 lbs||20435 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.08||4.07|
|Firebox Area||86 sq. ft||93 sq. ft|
|Grate Area||14.10 sq. ft||17.90 sq. ft|
|Evaporative Heating Surface||832 sq. ft||1114 sq. ft|
|Superheating Surface||178 sq. ft||241 sq. ft|
|Combined Heating Surface||1010 sq. ft||1355 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||169.49||199.46|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||2468||3222|
|Same as above plus superheater percentage||2912||3802|
|Same as above but substitute firebox area for grate area||17759||19753|