New Mexico Midland 4-6-0 "Ten-wheeler" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 1 (Locobase 12957)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 28, p 293. Works number was 27925 in April 1906.

Perhaps because of delays to the completion of the standard-gauge section of Georgia short line Gainesville Midland, the GM's first 100 took a hard right and wound up on the New Mexico Midland instead.

The NMM was constructed in 1904 as a 10-mile coal hauler that connected Carthage, NM with San Antonio, NM. Presumably, then , the specs quoted for the GM suited the NMM as well: "Loco [sic] must draw 155 to 170 tons of 2000 lbs. of cars an dloading up a grade of 3% in conjunction with 14-degree curve [269-ft curve radius] at 8 to 10 miles per hour, or 450 tons on level track at 50 miles per hour."

The 1 was the only locomotive on the line for most or all of its 26 years of operation.

Specifications by Steve Llanso of Sweat House Media
Locobase ID12,957
RailroadNew Mexico Midland
Number in Class1
Road Numbers1
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)14
Engine Wheelbase (ft)24.25
Ratio of driving wheelbase to overall engine wheebase 0.58
Overall Wheelbase (engine & tender) (ft)
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)96,000
Engine Weight (lbs)126,000
Tender Loaded Weight (lbs)120,000
Total Engine and Tender Weight (lbs)246,000
Tender Water Capacity (gals)6000
Tender Fuel Capacity (oil/coal) (gals/tons)
Minimum weight of rail (calculated) (lb/yd)53
Geometry Relating to Tractive Effort
Driver Diameter (in)56
Boiler Pressure (psi)180
High Pressure Cylinders (dia x stroke) (in)19" x 24"
Tractive Effort (lbs)23,671
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.06
Heating Ability
Firebox Area (sq ft)128
Grate Area (sq ft)40
Evaporative Heating Surface (sq ft)1912
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)1912
Evaporative Heating Surface/Cylinder Volume242.77
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation7200
Same as above plus superheater percentage7200
Same as above but substitute firebox area for grate area23,040
Power L15444
Power MT375.06

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