Rock Port, Langdon & Northern 2-4-2 "Columbian" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 2 (Locobase 14122)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 43, p. 217. Works number was 38948 in December 1912.

This very short Missouri shortline was incorporated in December 1889 to operate in the state's northwest. Its Rock Port terminus lay 5.6 miles to the north of Langdon, which was the junction point with the Chicago, Burlington & Quincy. .James H Hedgpeth ran the RPL&N from 1909 and soon increased revenue sufficiently to buy a brand-new saddletank engine.

After more than 55 years, the RPL&N closed on 11 November 1945.

Grandson J Pete Hedgpeth wrote a memoir entitled Five Miles of Family Ties.

Specifications by Steve Llanso of Sweat House Media
Locobase ID14122
RailroadRock Port, Langdon & Northern
Number in Class1
Road Numbers2
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase6'
Engine Wheelbase20.17'
Ratio of driving wheelbase to overall engine wheebase 0.30
Overall Wheelbase (engine & tender)20.17'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers52000 lbs
Engine Weight72000 lbs
Tender Light Weight
Total Engine and Tender Weight72000 lbs
Tender Water Capacity1000 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)43 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter44"
Boiler Pressure160 psi
Cylinders (dia x stroke)13" x 22"
Tractive Effort11492 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.52
Heating Ability
Firebox Area60 sq. ft
Grate Area11.80 sq. ft
Evaporative Heating Surface642 sq. ft
Superheating Surface
Combined Heating Surface642 sq. ft
Evaporative Heating Surface/Cylinder Volume189.95
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1888
Same as above plus superheater percentage1888
Same as above but substitute firebox area for grate area9600
Power L13270
Power MT277.27

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