Data from NdeM 1950 Locomotive Diagrams supplied in December 2010 by Allen Stanley. To see the resources this railroad passed through and shipped to Tampico, see "American Capital in Neuvo Leon", Lead and Zinc News, Volume 3, No 3 (10 March 1902), pp. 6-7. Works numbers were 13260 in February 1893; 13263-13265, 13268, 13268, 13283, 13303-13305 in March.
The M&MG , incorporated in 1888, linked the port of Tampico in the Gulf of Mexico with Monterey to its northwest. By 1893, the railroad's northern point had moved northwest through Geronimo Trevino to Sierra Mojada. In March 1902, the M&MG was absorbed by the Mexican Central, which itself was nationalized in 1909. The F-11 series at first was numbered in the 263-271 range. 263, 266, 268, 270-271 were retired before the NdeM renumbered the class in 1930 and designated it F-18..
The four surviving class members were numbered 740-473 in 1930.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 19/F-11/F-18 |
| Locobase ID | 11926 |
| Railroad | Monterey & Mexican Gulf |
| Country | Mexico |
| Whyte | 4-6-0 |
| Number in Class | 9 |
| Road Numbers | 19-27/475-483/263-271/740-743 |
| Gauge | Std |
| Number Built | 9 |
| Builder | Burnham, Williams & Co |
| Year | 1893 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 13.50 / 4.11 |
| Engine Wheelbase (ft / m) | 23.92 / 7.29 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.56 |
| Overall Wheelbase (engine & tender) (ft / m) | 46.25 / 14.10 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 80,300 / 36,424 |
| Engine Weight (lbs / kg) | 110,000 / 49,895 |
| Tender Loaded Weight (lbs / kg) | 75,900 / 34,428 |
| Total Engine and Tender Weight (lbs / kg) | 185,900 / 84,323 |
| Tender Water Capacity (gals / ML) | 3200 / 12.12 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3014 / 11,408 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 45 / 22.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 56 / 1422 |
| Boiler Pressure (psi / kPa) | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 19" x 24" / 483x610 |
| Tractive Effort (lbs / kg) | 21,041 / 9544.05 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.82 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 235 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 12.23 / 3.73 |
| Firebox Area (sq ft / m2) | 146 / 13.56 |
| Grate Area (sq ft / m2) | 16.88 / 1.57 |
| Evaporative Heating Surface (sq ft / m2) | 1653 / 153.62 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1653 / 153.62 |
| Evaporative Heating Surface/Cylinder Volume | 209.77 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2701 |
| Same as above plus superheater percentage | 2701 |
| Same as above but substitute firebox area for grate area | 23,360 |
| Power L1 | 4516 |
| Power MT | 371.96 |