Atlantic Coast Line 2-4-2 "Columbian" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class I-2 (Locobase 7666)

Data from ACL 1930 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. See also DeGolyer, Volume 20, p. 54. Works numbers were 14548-14549 in November 1895.

A misstep in the quest for more power at speed, these Columbias were among the very first of the arrangement to go into North American service. Baldwin's specs included the retirement that these locomotives could move ten-car trains up a 1.5% grade at 40 mph (64 kph) .

Numbered 154 when delivered in November 1895, the lead locomotive operated on the Wilmington & Weldon while 76 was assigned to the Wilmington, Columbia & Augusta. Although they can't be said to have been sterling engines, they managed to be useful for almost 40 years.

A writer with an admitted passion for this oddball wheel arrangement has put up a website devoted to the Columbias., accessed 6 July 2006. He notes that the first American engine of the type had 84" drivers and ran as a Vauclain compound. This pair was more realistically scaled, although they retained the 50"-diameter leading truck wheels.

Specifications by Steve Llanso of Sweat House Media
Locobase ID7666
RailroadAtlantic Coast Line (ACL)
Number in Class2
Road Numbers154, 541 / 93-94
Number Built2
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase 6.25'
Engine Wheelbase31.50'
Ratio of driving wheelbase to overall engine wheebase 0.20
Overall Wheelbase (engine & tender)48.37'
Axle Loading (Maximum Weight per Axle)38000 lbs
Weight on Drivers75000 lbs
Engine Weight124500 lbs
Tender Light Weight82900 lbs
Total Engine and Tender Weight207400 lbs
Tender Water Capacity3600 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)63 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter72"
Boiler Pressure180 psi
Cylinders (dia x stroke)19" x 24"
Tractive Effort18411 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.07
Heating Ability
Firebox Area133.50 sq. ft
Grate Area26.11 sq. ft
Evaporative Heating Surface1687 sq. ft
Superheating Surface
Combined Heating Surface1687 sq. ft
Evaporative Heating Surface/Cylinder Volume214.20
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4700
Same as above plus superheater percentage4700
Same as above but substitute firebox area for grate area24030
Power L16457
Power MT379.61


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