Data from DeGolyer, Volume 30, p. 84; and NdeM 1950 Locomotive Diagrams Standard Gauge supplied in August 2013 by Allen Stanley from his extensive Rail Data Exchange collection. Alco's Brooks works built the first eight switchers in 1902; they had works numbers 26676-26683 in August 1902. Baldwin added ten more in 1907 with works numbers 31828-31829 in September 1907; and 31878, 31938-31939, 31963-31964, 31990, 32011 in October.
Baldwin delivered oil burners so the grates had an ashpan open only at the back. Like most such installations, these switchers mounted in the front of the firebox. Fire bricks lined the firebox. 50" drivers and tender capacities probably allowed for some transfer jobs.
Principal Dimensions by Steve Llanso of Middle Run Media | |
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Class | B-12 |
Locobase ID | 16304 |
Railroad | Mexican Central |
Country | Mexico |
Whyte | 0-6-0 |
Number in Class | 18 |
Road Numbers | 1043-1050, 1058-1067 |
Gauge | Std |
Number Built | 18 |
Builder | various |
Year | 1902 |
Valve Gear | Stephenson |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 11 / 3.35 |
Engine Wheelbase (ft / m) | 11 / 3.35 |
Ratio of driving wheelbase to overall engine wheelbase | 1 |
Overall Wheelbase (engine & tender) (ft / m) | |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
Weight on Drivers (lbs / kg) | 110,000 / 49,895 |
Engine Weight (lbs / kg) | 110,000 / 49,895 |
Tender Loaded Weight (lbs / kg) | 81,550 / 36,991 |
Total Engine and Tender Weight (lbs / kg) | 191,550 / 86,886 |
Tender Water Capacity (gals / ML) | 3900 / 14.77 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1200 / 4542 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 61 / 30.50 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 50 / 1270 |
Boiler Pressure (psi / kPa) | 180 / 1240 |
High Pressure Cylinders (dia x stroke) (in / mm) | 19" x 24" / 483x610 |
Tractive Effort (lbs / kg) | 26,512 / 12025.66 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.15 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 270 - 2" / 51 |
Flues (number - dia) (in / mm) | |
Flue/Tube length (ft / m) | 11.62 / 3.54 |
Firebox Area (sq ft / m2) | 125.50 / 11.66 |
Grate Area (sq ft / m2) | 24.20 / 2.25 |
Evaporative Heating Surface (sq ft / m2) | 1758 / 163.38 |
Superheating Surface (sq ft / m2) | |
Combined Heating Surface (sq ft / m2) | 1758 / 163.38 |
Evaporative Heating Surface/Cylinder Volume | 223.10 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 4356 |
Same as above plus superheater percentage | 4356 |
Same as above but substitute firebox area for grate area | 22,590 |
Power L1 | 4541 |
Power MT | 273.03 |