Alamagordo & Sacramento Mountain 2-4-2 "Columbian" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 102 (Locobase 12068)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 18, p.150,. Works number was 13361 in April 1893. See also . Originally built by Baldwin to display at the 1893 Columbian Exposition, this tank was sold to the New Mexico Coal & Railway Company. But apparently the engine was sold to the A&SM before it was delivered - the tender description in the specs shows Baldwin's name being struck and changed to Alamagordo & Sacramento Mountain.

The A&SM was chartered to connect the newly founded Alamagordo with the projected "Cloudcroft" resort farther up in the mountains. The Mountain Monthly website --, accessed 8 September 2007 -- presents a long article about the real objective, which was to cart logs down from the summit of the Sacramento Mountains. To achieve this goal, the railroad had to ascend 4,000 ft over a winding 26-mile line to a maximum of 8,700 ft, the highest elevation reached by a standard-gauge railroad. The line was finally torn up in 1947.

When the A & SM was absorbed by the El Paso & Southwestern, the 102 was renumbered 202. In 1906, the EP & SW sold the tank to the Ferrocarril Nacazari, the latter located in Sonora State in Mexico.

Specifications by Steve Llanso of Sweat House Media
Locobase ID12,068
RailroadAlamagordo & Sacramento Mountain
Number in Class1
Road Numbers102
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)7
Engine Wheelbase (ft)22.08
Ratio of driving wheelbase to overall engine wheebase 0.32
Overall Wheelbase (engine & tender) (ft)22.08
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)46,630
Engine Weight (lbs)72,130
Tender Loaded Weight (lbs)
Total Engine and Tender Weight (lbs)72,130
Tender Water Capacity (gals)1650
Tender Fuel Capacity (oil/coal) (gals/tons)
Minimum weight of rail (calculated) (lb/yd)39
Geometry Relating to Tractive Effort
Driver Diameter (in)44
Boiler Pressure (psi)140
High Pressure Cylinders (dia x stroke) (in)14" x 24"
Tractive Effort (lbs)12,722
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.67
Heating Ability
Firebox Area (sq ft)61
Grate Area (sq ft)11.70
Evaporative Heating Surface (sq ft)721
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)721
Evaporative Heating Surface/Cylinder Volume168.61
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1638
Same as above plus superheater percentage1638
Same as above but substitute firebox area for grate area8540
Power L12463
Power MT232.90

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