San Antonio, Uvalde & Gulf 4-6-0 "Ten-Wheeler" Locomotives in 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 Rail Data Exchange. 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 Rail Data Exchange. 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.

Principal Dimensions 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 Wheelbase (ft / m)12 / 3.6614 / 4.27
Engine Wheelbase (ft / m)23.08 / 7.0324.58 / 7.49
Ratio of driving wheelbase to overall engine wheebase 0.52 0.57
Overall Wheelbase (engine & tender) (ft / m)56.08 / 17.0954.45 / 16.60
Axle Loading (Maximum Weight per Axle) (lbs / kg)42,552 / 19,301
Weight on Drivers (lbs / kg)113,500 / 51,483116,000 / 52,617
Engine Weight (lbs / kg)147,500 / 66,905162,000 / 73,482
Tender Loaded Weight (lbs / kg)123,000 / 55,792109,700 / 49,759
Total Engine and Tender Weight (lbs / kg)270,500 / 122,697271,700 / 123,241
Tender Water Capacity (gals / ML)6000 / 22.736000 / 22.73
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)2741 / 10.402721 / 10.30
Minimum weight of rail (calculated) (lb/yd / kg/m)63 / 31.5064 / 32
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)57 / 144863 / 1600
Boiler Pressure (psi / kPa)180 / 12.40200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)20" x 24" / 508x61019.5" x 26" / 495x660
Tractive Effort (lbs / kg)25,768 / 11688.1826,678 / 12100.95
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.40 4.35
Heating Ability
Firebox Area (sq ft / m2)155 / 14.41160 / 14.87
Grate Area (sq ft / m2)31 / 2.8829 / 2.70
Evaporative Heating Surface (sq ft / m2)1560 / 144.982127 / 197.68
Superheating Surface (sq ft / m2)310 / 28.81
Combined Heating Surface (sq ft / m2)1870 / 173.792127 / 197.68
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 area32,64332,000
Power L110,0436839
Power MT585.22389.93