St Louis-San Francisco 2-8-8-2 "Chesapeake" Locomotives in the USA

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Class Details by Steve Llanso of Sweat House Media

Class 2001 (Locobase 6454)

Data from builder's card shown on the FMIG site (12 January 2005). See also "Mallet for the Frisco System", Railway & Locomotive Engineering, Volume XXIII [23], No 12 (December 1910), pp. . Works numbers were 48652-48656 and 48734-48735 in October 1910.

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.


Class 2001 - superheated (Locobase 8640)

Data from StLSF 1930 and SL&SF All Time Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

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
Class20012001 - superheated
Locobase ID6454 8640
RailroadSt Louis-San Francisco (Frisco/(SLSF)St Louis-San Francisco (Frisco/(SLSF)
CountryUSAUSA
Whyte2-8-8-22-8-8-2
Number in Class77
Road Numbers2001-20072001-2007
GaugeStdStd
Number Built77
BuilderAlco-SchenectadyFrisco
Year19101918
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)15.67 / 4.7815.50 / 4.72
Engine Wheelbase (ft / m)56.83 / 17.3256.83 / 17.32
Ratio of driving wheelbase to overall engine wheebase 0.28 0.27
Overall Wheelbase (engine & tender) (ft / m)85.52 / 26.0785.52 / 26.07
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)360,000 / 163,293360,000 / 163,293
Engine Weight (lbs / kg)418,000 / 189,602418,000 / 189,602
Tender Loaded Weight (lbs / kg)149,600 / 67,857161,300 / 73,165
Total Engine and Tender Weight (lbs / kg)567,600 / 257,459579,300 / 262,767
Tender Water Capacity (gals / ML)8000 / 30.308000 / 30.30
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)10 / 9.1016 / 14.50
Minimum weight of rail (calculated) (lb/yd / kg/m)75 / 37.5075 / 37.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)57 / 144857 / 1448
Boiler Pressure (psi / kPa)200 / 13.80200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)24.5" x 30" / 622x76224.5" x 30" / 622x762
Low Pressure Cylinders (dia x stroke) (in / mm)39" x 30" / 991x76239" x 30" / 991x762
Tractive Effort (lbs / kg)77,018 / 34934.8277,018 / 34934.82
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.67 4.67
Heating Ability
Firebox Area (sq ft / m2)344.70 / 32.04350 / 32.53
Grate Area (sq ft / m2)75.40 / 7.0175.30 / 7
Evaporative Heating Surface (sq ft / m2)5162 / 479.744371 / 406.23
Superheating Surface (sq ft / m2)807 / 75
Combined Heating Surface (sq ft / m2)5162 / 479.745178 / 481.23
Evaporative Heating Surface/Cylinder Volume315.35267.02
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation15,08015,060
Same as above plus superheater percentage15,08017,470
Same as above but substitute firebox area for grate area68,94081,200
Power L131546131
Power MT154.52300.37

Reference