Missouri & North Arkansas 4-4-0 "American" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class 15 (Locobase 13267)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 31, p. 188, Volume 32, p. 257. See Locobase 6638 for a short history of the road, including a discussion of the 1914 accident that took 43 lives. Works number was 32180 in November 1907 and 32856 in July 1908.


Class 23 (Locobase 13268)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 39, p. 5. See Locobase 6638 for a short history of the road, including a discussion of the 1914 accident that took 43 lives. Works number was 37069 in October 1911.

This locomotive was the first of four locomotives ordered as the #1 by Midland Pennsylvania. Before its delivery to the MP, the 1 was resold to the M&N. It was originally to be numbered 21, but had that changed to 23 before its delivery.

It remained on the roster until scrapped in April 1939.

Specifications by Steve Llanso of Sweat House Media
Class1523
Locobase ID13267 13268
RailroadMissouri & North ArkansasMissouri & North Arkansas
CountryUSAUSA
Whyte4-4-04-4-0
Number in Class21
Road Numbers15-1623/17
GaugeStdStd
Number Built21
BuilderBurnham, Williams & CoBaldwin
Year19081911
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase 9.08' 8.50'
Engine Wheelbase23.92'22.58'
Ratio of driving wheelbase to overall engine wheebase 0.38 0.38
Overall Wheelbase (engine & tender)46.58'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers73000 lbs76000 lbs
Engine Weight115000 lbs113000 lbs
Tender Light Weight80000 lbs80000 lbs
Total Engine and Tender Weight195000 lbs193000 lbs
Tender Water Capacity4000 gals4000 gals
Tender Fuel Capacity (oil/coal)6 tons6 tons
Minimum weight of rail (calculated)61 lb/yard63 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter63"68"
Boiler Pressure180 psi180 psi
Cylinders (dia x stroke)18" x 24"18" x 24"
Tractive Effort18885 lbs17496 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.87 4.34
Heating Ability
Firebox Area148.80 sq. ft126.50 sq. ft
Grate Area18.50 sq. ft26 sq. ft
Evaporative Heating Surface1643 sq. ft1740 sq. ft
Superheating Surface
Combined Heating Surface1643 sq. ft1740 sq. ft
Evaporative Heating Surface/Cylinder Volume232.44246.16
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation33304680
Same as above plus superheater percentage33304680
Same as above but substitute firebox area for grate area2678422770
Power L163826847
Power MT385.48397.24


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