Data from "Narrow Gauge Engine for the Mexican Southern", Railway and Locomotive Engineering, Volume XV [15], No 9 (September 1902), p. 391; "Locomotives for the Mexican Southern", Railway Master Mechanic, Volume 26, No 7 (July 1902), pp. 260. Works numbers were 25797-25798 in April 1902.
Outside-frame Ten-wheelers with slide valves, straight boilers and very similar to the Schenectady-built engines (Locobase 3238) delivered to the Interoceanic in 1898. Characterised by R&LE as heavy for the 3' gauge, the engine also sported a boiler with fewer, but larger-diameter tubes than most other skinny-gauge locomotives. The photograph shows unusually large bogie-truck wheels in relation to the driver diameter and a wide gap between the second and third drivers to accommodate the firebox.
Eventually passing into the hands of the Nacional de Mexico, the pair survived until 1954.
Principal Dimensions by Steve Llanso of Middle Run Media | |
---|---|
Class | F-05 |
Locobase ID | 9960 |
Railroad | Mexicano del Sur |
Country | Mexico |
Whyte | 4-6-0 |
Number in Class | 2 |
Road Numbers | 103-104/261-262 |
Gauge | 3' |
Number Built | 2 |
Builder | Alco-Cooke |
Year | 1902 |
Valve Gear | Stephenson |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 13.17 / 4.01 |
Engine Wheelbase (ft / m) | 22.08 / 6.73 |
Ratio of driving wheelbase to overall engine wheelbase | 0.60 |
Overall Wheelbase (engine & tender) (ft / m) | 42.58 / 12.98 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
Weight on Drivers (lbs / kg) | 58,000 / 26,308 |
Engine Weight (lbs / kg) | 87,000 / 39,463 |
Tender Loaded Weight (lbs / kg) | 67,000 / 30,391 |
Total Engine and Tender Weight (lbs / kg) | 154,000 / 69,854 |
Tender Water Capacity (gals / ML) | 3000 / 11.36 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 5 / 5 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 32 / 16 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 47 / 1194 |
Boiler Pressure (psi / kPa) | 160 / 1100 |
High Pressure Cylinders (dia x stroke) (in / mm) | 17" x 20" / 432x508 |
Tractive Effort (lbs / kg) | 16,725 / 7586.34 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.47 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 134 - 2.25" / 57 |
Flues (number - dia) (in / mm) | |
Flue/Tube length (ft / m) | 11.58 / 3.53 |
Firebox Area (sq ft / m2) | 77 / 7.16 |
Grate Area (sq ft / m2) | 15.38 / 1.43 |
Evaporative Heating Surface (sq ft / m2) | 1054 / 97.96 |
Superheating Surface (sq ft / m2) | |
Combined Heating Surface (sq ft / m2) | 1054 / 97.96 |
Evaporative Heating Surface/Cylinder Volume | 200.76 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 2461 |
Same as above plus superheater percentage | 2461 |
Same as above but substitute firebox area for grate area | 12,320 |
Power L1 | 3435 |
Power MT | 391.70 |