Data from NdeM 1926ca Locomotive Diagrams supplied in December 2010 by Allen Stanley.
Obviously the original boiler on the VC a A's #4 (Locobase 11838) satisfactory for long. By the time it appeared in the 1926 roster book, it had acquired a new vessel that had fewer, larger-diameter tubes and a bigger firebox.
Data from NdeM 1926ca Locomotive Diagrams supplied in December 2010 by Allen Stanley.
Locobase is still researching the origins of this locomotive, but he found a note on the diagram dated 16 March 1935 that described a change in the boiler's tube layout. At the time, the locomotive had 144 2" tubes each measuring 9 ft 10 3/4" (3.32 m) long.
| Principal Dimensions by Steve Llanso of Middle Run Media | ||
|---|---|---|
| Class | 4 / G-035 / G-04 | C-01/G-036/ G-02 |
| Locobase ID | 11897 | 11895 |
| Railroad | Vera Cruz a Alvarado | Vera Cruz a Alvarado |
| Country | Mexico | Mexico |
| Whyte | 2-8-0 | 2-8-0 |
| Number in Class | 1 | 1 |
| Road Numbers | 4 / 153 | 6/152 |
| Gauge | 3' | 3' |
| Number Built | 1 | 1 |
| Builder | NdeM | |
| Year | 1911 | |
| Valve Gear | Stephenson | Stephenson |
| Locomotive Length and Weight | ||
| Driver Wheelbase (ft / m) | 11.75 / 3.58 | 11.33 / 3.45 |
| Engine Wheelbase (ft / m) | 18.02 / 5.49 | 17.50 / 5.33 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.65 | 0.65 |
| Overall Wheelbase (engine & tender) (ft / m) | 39.06 / 11.91 | 41 / 12.50 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
| Weight on Drivers (lbs / kg) | 60,582 / 27,480 | 59,582 / 27,026 |
| Engine Weight (lbs / kg) | 70,604 / 32,025 | 65,815 / 29,853 |
| Tender Loaded Weight (lbs / kg) | 41,294 / 18,731 | 50,352 / 22,839 |
| Total Engine and Tender Weight (lbs / kg) | 111,898 / 50,756 | 116,167 / 52,692 |
| Tender Water Capacity (gals / ML) | 1810 / 6.86 | 2071 / 7.84 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1260 / 4769 | 1027 / 3887 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 25 / 12.50 | 25 / 12.50 |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter (in / mm) | 38 / 965 | 38 / 965 |
| Boiler Pressure (psi / kPa) | 140 / 970 | 135 / 930 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 15" x 20" / 381x508 | 15" x 20" / 381x508 |
| Tractive Effort (lbs / kg) | 14,092 / 6392.03 | 13,589 / 6163.87 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.30 | 4.38 |
| Heating Ability | ||
| Tubes (number - dia) (in / mm) | 132 - 2" / 51 | 140 - 2" / 51 |
| Flues (number - dia) (in / mm) | ||
| Flue/Tube length (ft / m) | 10.83 / 3.30 | 10.33 / 3.15 |
| Firebox Area (sq ft / m2) | 109.66 / 10.19 | 93.95 / 8.73 |
| Grate Area (sq ft / m2) | 15.60 / 1.45 | 10.12 / 0.94 |
| Evaporative Heating Surface (sq ft / m2) | 858 / 79.74 | 851 / 79.09 |
| Superheating Surface (sq ft / m2) | ||
| Combined Heating Surface (sq ft / m2) | 858 / 79.74 | 851 / 79.09 |
| Evaporative Heating Surface/Cylinder Volume | 209.78 | 208.07 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 2184 | 1366 |
| Same as above plus superheater percentage | 2184 | 1366 |
| Same as above but substitute firebox area for grate area | 15,352 | 12,683 |
| Power L1 | 3049 | 2761 |
| Power MT | 443.82 | 408.64 |