The Alco-Frisco tractive effort is given as 83,300 lb. The first five were delivered to the Frisco's sub Kansas City, Fort Scott & Memphis.
The brief comment notes that these were the most powerful 2-8-8-2s when delivered (and the first from Alco), but that they were unsatisfactory in service. Wes Barris of http://www.steamlocomotive.com (http://www.steamlocomotive.com/articulated/slsf.shtml, visited 12 January 2005) states that the tender was so small that the locomotives had a very short range. (Locobase also notes that the boiler seems small given the ratios and factors and the tubes too long.)
Despite the imperfections, the Frisco superheated these locomotives in the 1920s; see Locobase 8640.
Despite the weaknesses describe in Locobase 6454, the Frisco's only articulateds received the modifications applied to virtually all locomotives worth the effort. In particular, the engines were superheated and the HP cylinders now sported 14" piston valves. At least three of the engines -- 2001, 2004, 2007 -- later used piston valves on the LP cylinders as well.
They wound up as switchers of iron-ore trains near Birmingham, Alabama. "Someone could correct me if I'm wrong," comments Wes Barris of http://www.steamlocomotive.com (http://www.steamlocomotive.com/articulated/slsf.shtml, "but they were probably the largest steam switch engines."
The class was "dismissed from service" over a long period. 2005 went in December 1929 at Springfield, Mo. The others all retired in Birmingham, Ala: 2002, 2003, & 2006 all withdrew in July 1935; 2007 followed a few months later in April 1936 and 2001 & 2004 went in April 1939.
|Specifications by Steve Llanso of Sweat House Media|
|Class||2001||2001 - superheated|
|Railroad||St Louis-San Francisco (Frisco/(SLSF)||St Louis-San Francisco (Frisco/(SLSF)|
|Number in Class||7||7|
|Locomotive Length and Weight|
|Driver Wheelbase (ft / m)||15.67 / 4.78||15.50 / 4.72|
|Engine Wheelbase (ft / m)||56.83 / 17.32||56.83 / 17.32|
|Ratio of driving wheelbase to overall engine wheebase||0.28||0.27|
|Overall Wheelbase (engine & tender) (ft / m)||85.52 / 26.07||85.52 / 26.07|
|Axle Loading (Maximum Weight per Axle) (lbs / kg)|
|Weight on Drivers (lbs / kg)||360,000 / 163,293||360,000 / 163,293|
|Engine Weight (lbs / kg)||418,000 / 189,602||418,000 / 189,602|
|Tender Loaded Weight (lbs / kg)||149,600 / 67,857||161,300 / 73,165|
|Total Engine and Tender Weight (lbs / kg)||567,600 / 257,459||579,300 / 262,767|
|Tender Water Capacity (gals / ML)||8000 / 30.30||8000 / 30.30|
|Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)||10 / 9.10||16 / 14.50|
|Minimum weight of rail (calculated) (lb/yd / kg/m)||75 / 37.50||75 / 37.50|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in / mm)||57 / 1448||57 / 1448|
|Boiler Pressure (psi / kPa)||200 / 13.80||200 / 13.80|
|High Pressure Cylinders (dia x stroke) (in / mm)||24.5" x 30" / 622x762||24.5" x 30" / 622x762|
|Low Pressure Cylinders (dia x stroke) (in / mm)||39" x 30" / 991x762||39" x 30" / 991x762|
|Tractive Effort (lbs / kg)||77,018 / 34934.82||77,018 / 34934.82|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.67||4.67|
|Firebox Area (sq ft / m2)||344.70 / 32.04||350 / 32.53|
|Grate Area (sq ft / m2)||75.40 / 7.01||75.30 / 7|
|Evaporative Heating Surface (sq ft / m2)||5162 / 479.74||4371 / 406.23|
|Superheating Surface (sq ft / m2)||807 / 75|
|Combined Heating Surface (sq ft / m2)||5162 / 479.74||5178 / 481.23|
|Evaporative Heating Surface/Cylinder Volume||315.35||267.02|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||15,080||15,060|
|Same as above plus superheater percentage||15,080||17,470|
|Same as above but substitute firebox area for grate area||68,940||81,200|