San Antonio, Uvalde & Gulf 4-6-0 "Ten-wheeler" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class 30 / TN-63 - 25.7 (Locobase 7757)

Data from MP SUBS 7 - 1935 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. See Locobase 7819 for an outline history of the SAU & G line.

These Ten-wheelers were built a year after the SAU & G began service. Their driver diameter increased by an inch to 58" in 1931, after the Sausage Route was folded into the MP. The 298 was scrapped at Palestine in December 1934.


Class 33 / TN-63 - 297 (Locobase 7755)

Data from MP SUBS 7 - 1935 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. See Locobase 7819 for an outline history of the SAU & G line.

This Ten-wheeler was built a year after the SAU & G began service. It was never superheated.

Specifications by Steve Llanso of Sweat House Media
Class30 / TN-63 - 25.733 / TN-63 - 297
Locobase ID7757 7755
RailroadSan Antonio, Uvalde & Gulf (NOT & M/MP)San Antonio, Uvalde & Gulf (NOT & M/MP)
CountryUSAUSA
Whyte4-6-04-6-0
Number in Class21
Road Numbers30-31 / 298-29933 / 297
GaugeStdStd
Number Built21
BuilderAlcoAlco
Year19131913
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase12'14'
Engine Wheelbase23.08'24.58'
Ratio of driving wheelbase to overall engine wheebase 0.52 0.57
Overall Wheelbase (engine & tender)56.08'54.45'
Axle Loading (Maximum Weight per Axle)42552 lbs
Weight on Drivers113500 lbs116000 lbs
Engine Weight147500 lbs162000 lbs
Tender Light Weight123000 lbs109700 lbs
Total Engine and Tender Weight270500 lbs271700 lbs
Tender Water Capacity6000 gals6000 gals
Tender Fuel Capacity (oil/coal)2741 gals2721 gals
Minimum weight of rail (calculated)63 lb/yard64 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter57"63"
Boiler Pressure180 psi200 psi
Cylinders (dia x stroke)20" x 24"19.5" x 26"
Tractive Effort25768 lbs26678 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.40 4.35
Heating Ability
Firebox Area155 sq. ft160 sq. ft
Grate Area31 sq. ft29 sq. ft
Evaporative Heating Surface1560 sq. ft2127 sq. ft
Superheating Surface310 sq. ft
Combined Heating Surface1870 sq. ft2127 sq. ft
Evaporative Heating Surface/Cylinder Volume178.76236.67
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation55805800
Same as above plus superheater percentage65295800
Same as above but substitute firebox area for grate area3264332000
Power L1100436839
Power MT585.22389.93


If you have any railroad data such as diagram books, rail station plans or anything else that you would be willing to share, please contact us.