San Antonio Southern 2-8-0 "Consolidation" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class C-51 - 30.4 (Locobase 7765)

Data from MP 8 - 1936 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 65, p. 245. Works number was 54311 in January 1920.

Handbook of Texas Online, s.v. "," [] (accessed July 30, 2006) has the details on the SAS, which succeeded to the assets of the Artesian Belt Railway.

Given that many Baldwins with these dimensions and weights served plantation railways, it's a little surprising to see this oil-burning Consolidation sold for common-carrier freight service. Built for stock on order by the foreign sales department, it proved suitable for the SAS's requirements. The It was one of the few purchases by the SAS between its appearance in Atascosa County and its absorption by the New Orleans, Texas & Mexico in 1927.

It's a little more surprising to note that this small 2-8-0 had such a long career with the NOT&M. At some point, its tube count was lowered slightly to 234, which reduced its evaporative heating surface area to 1,728 sq ft (160.5 sq m) before being retired in 1948.

Principal Dimensions by Steve Llanso of Middle Run Media

ClassC-51 - 30.4
Locobase ID7765
RailroadSan Antonio Southern (NOT & M/MP)
Number in Class1
Road Numbers4 / 1009
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)14.50 / 4.42
Engine Wheelbase (ft / m)22 / 6.71
Ratio of driving wheelbase to overall engine wheelbase 0.66
Overall Wheelbase (engine & tender) (ft / m)51.75 / 15.77
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)118,300 / 53,660
Engine Weight (lbs / kg)132,000 / 59,874
Tender Loaded Weight (lbs / kg)112,500 / 51,029
Total Engine and Tender Weight (lbs / kg)244,500 / 110,903
Tender Water Capacity (gals / ML)5000 / 18.94
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)2500 / 9463
Minimum weight of rail (calculated) (lb/yd / kg/m)49 / 24.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)51 / 1295
Boiler Pressure (psi / kPa)190 / 13.10
High Pressure Cylinders (dia x stroke) (in / mm)20" x 24" / 508x610
Tractive Effort (lbs / kg)30,400 / 13789.22
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.89
Heating Ability
Tubes (number - dia) (in / mm)234 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)13 / 3.96
Firebox Area (sq ft / m2)144 / 13.38
Grate Area (sq ft / m2)30.30 / 2.82
Evaporative Heating Surface (sq ft / m2)1728 / 160.59
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1728 / 160.59
Evaporative Heating Surface/Cylinder Volume197.94
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5757
Same as above plus superheater percentage5757
Same as above but substitute firebox area for grate area27,360
Power L14529
Power MT337.61

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Wes Barris