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

Class Details by Steve Llanso of Sweat House Media

Class 1230 (Locobase 11966)

Data from NdeM 1950 Locomotive Diagrams Standard Gauge supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

NdeM's diagram has no further information on the origins of this locomotive and Locobase found only one other entry that had 22 1/4" cylinder diameters.

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.

Specifications by Steve Llanso of Sweat House Media
Locobase ID11966 11972
RailroadNacional de Mexico (NdeM)Nacional de Mexico (NdeM)
Number in Class12
Road Numbers12301365-1366
Number Built1
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase14.67'14.67'
Engine Wheelbase25.23'23.42'
Ratio of driving wheelbase to overall engine wheebase 0.58 0.63
Overall Wheelbase (engine & tender)55.35'57.50'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers164700 lbs160716 lbs
Engine Weight183800 lbs178574 lbs
Tender Light Weight86680 lbs158732 lbs
Total Engine and Tender Weight270480 lbs337306 lbs
Tender Water Capacity6500 gals7000 gals
Tender Fuel Capacity (oil/coal)3438 gals3000 gals
Minimum weight of rail (calculated)69 lb/yard67 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter55"55.50"
Boiler Pressure185 psi180 psi
Cylinders (dia x stroke)22.25" x 28"22" x 28"
Tractive Effort39632 lbs37360 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.16 4.30
Heating Ability
Firebox Area255 sq. ft266.95 sq. ft
Grate Area34.80 sq. ft43.50 sq. ft
Evaporative Heating Surface2555 sq. ft2665 sq. ft
Superheating Surface
Combined Heating Surface2555 sq. ft2665 sq. ft
Evaporative Heating Surface/Cylinder Volume202.77216.33
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation64387830
Same as above plus superheater percentage64387830
Same as above but substitute firebox area for grate area4717548051
Power L151555406
Power MT276.01296.63




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