San Antonio Southern 2-8-0 "Consolidation" Locomotives of 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 Raildata collection. 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. "," http://www.tsha.utexas.edu/handbook/online/articles/SS/eqs10.html (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.

Specifications by Steve Llanso of Sweat House Media
ClassC-51 - 30.4
Locobase ID7765
RailroadSan Antonio Southern (NOT & M/MP)
CountryUSA
Whyte2-8-0
Number in Class1
Road Numbers4 / 1009
GaugeStd
Number Built1
BuilderBaldwin
Year1920
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase14.50'
Engine Wheelbase22'
Ratio of driving wheelbase to overall engine wheebase 0.66
Overall Wheelbase (engine & tender)51.75'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers118300 lbs
Engine Weight132000 lbs
Tender Light Weight112500 lbs
Total Engine and Tender Weight244500 lbs
Tender Water Capacity5000 gals
Tender Fuel Capacity (oil/coal)2500 gals
Minimum weight of rail (calculated)49 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter51"
Boiler Pressure190 psi
Cylinders (dia x stroke)20" x 24"
Tractive Effort30400 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.89
Heating Ability
Firebox Area144 sq. ft
Grate Area30.30 sq. ft
Evaporative Heating Surface1728 sq. ft
Superheating Surface
Combined Heating Surface1728 sq. ft
Evaporative Heating Surface/Cylinder Volume198.01
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 area27360
Power L14530
Power MT337.68


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