Nacional de Mexico 2-8-0 "Consolidation" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class G-30 (Locobase 11972)

Data from NdeM 1946 Locomotive Diagrams Standard Gauge supplied in May 2005 by Allen Stanley.

The two former Bullfrog & Goldfield Consolidations produced in 1906 (Locobase 11971) came to the NdeM in 1927 by way of the American Smelting & Refining Corporation. By the time of the 1946 diagram, the boiler had lost 30 tubes, but the firebox heating surface had increased by 70 sq ft (6.50 sq m). This may all have been associated with a conversion to oil-firing. The modified engines were a bit lighter on the rails as well.

1366 was retired in September 1953 while 1364 lasted until July 1958.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID11,972
RailroadNacional de Mexico (NdeM)
Number in Class2
Road Numbers1365-1366
Number Built
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)14.67 / 4.47
Engine Wheelbase (ft / m)23.42 / 7.14
Ratio of driving wheelbase to overall engine wheebase 0.63
Overall Wheelbase (engine & tender) (ft / m)57.50 / 17.53
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)160,716 / 72,900
Engine Weight (lbs / kg)178,574 / 81,000
Tender Loaded Weight (lbs / kg)158,732 / 72,000
Total Engine and Tender Weight (lbs / kg)337,306 / 153,000
Tender Water Capacity (gals / ML)7000 / 26.52
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)3000 / 11.40
Minimum weight of rail (calculated) (lb/yd / kg/m)67 / 33.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)55.50 / 1410
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)22" x 28" / 559x711
Tractive Effort (lbs / kg)37,360 / 16946.23
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.30
Heating Ability
Firebox Area (sq ft / m2)266.95 / 24.81
Grate Area (sq ft / m2)43.50 / 4.04
Evaporative Heating Surface (sq ft / m2)2665 / 247.68
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2665 / 247.68
Evaporative Heating Surface/Cylinder Volume216.33
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation7830
Same as above plus superheater percentage7830
Same as above but substitute firebox area for grate area48,051
Power L15406
Power MT296.63

  • 40 (National Museum of Mexican Railroads, Puebla, PUE, Mexico. Photo courtesy Juan Viladrosa)
  • 40 (National Museum of Mexican Railroads, Puebla, PUE, Mexico. Photo courtesy Toshihiko Yamada)
  • 1399 (Ciudad Frontera, COA, Mexico)
  • 1399 (Ciudad Frontera, COA, Mexico)
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