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 ID13,267 13,268
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 (ft) 9.08 8.50
Engine Wheelbase (ft)23.9222.58
Ratio of driving wheelbase to overall engine wheebase 0.38 0.38
Overall Wheelbase (engine & tender) (ft)46.58
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)73,00076,000
Engine Weight (lbs)115,000113,000
Tender Loaded Weight (lbs)80,00080,000
Total Engine and Tender Weight (lbs)195,000193,000
Tender Water Capacity (gals)40004000
Tender Fuel Capacity (oil/coal) (gals/tons)66
Minimum weight of rail (calculated) (lb/yd)6163
Geometry Relating to Tractive Effort
Driver Diameter (in)6368
Boiler Pressure (psi)180180
High Pressure Cylinders (dia x stroke) (in)18" x 24"18" x 24"
Tractive Effort (lbs)18,88517,496
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.87 4.34
Heating Ability
Firebox Area (sq ft)148.80126.50
Grate Area (sq ft)18.5026
Evaporative Heating Surface (sq ft)16431740
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)16431740
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 area26,78422,770
Power L163826847
Power MT385.48397.24


If you have any railroad data such as diagram books, rail station plans or anything else that you would be willing to share, please contact us.