Rock Port, Langdon & Northern 2-4-2 "Columbian" Locomotives in 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.

Principal Dimensions by Steve Llanso of Middle Run Media

Locobase ID14122
RailroadRock Port, Langdon & Northern
Number in Class1
Road Numbers2
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)6 / 1.83
Engine Wheelbase (ft / m)20.17 / 6.15
Ratio of driving wheelbase to overall engine wheelbase 0.30
Overall Wheelbase (engine & tender) (ft / m)20.17 / 6.15
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)52,000 / 23,587
Engine Weight (lbs / kg)72,000 / 32,659
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)72,000
Tender Water Capacity (gals / ML)1000 / 3.79
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)43 / 21.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1118
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)13" x 22" / 330x559
Tractive Effort (lbs / kg)11,492 / 5212.69
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.52
Heating Ability
Tubes (number - dia) (in / mm)116 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 9.67 / 2.95
Firebox Area (sq ft / m2)60 / 5.57
Grate Area (sq ft / m2)11.80 / 1.10
Evaporative Heating Surface (sq ft / m2)642 / 59.64
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)642 / 59.64
Evaporative Heating Surface/Cylinder Volume189.94
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

All material Copyright ©
Wes Barris