Atlantic Coast Line 2-4-2 "Columbian" Locomotives in 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 Rail Data Exchange. 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.

Principal Dimensions 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 (ft / m) 6.25 / 1.90
Engine Wheelbase (ft / m)31.50 / 9.60
Ratio of driving wheelbase to overall engine wheebase 0.20
Overall Wheelbase (engine & tender) (ft / m)48.37 / 14.74
Axle Loading (Maximum Weight per Axle) (lbs / kg)38,000 / 17,237
Weight on Drivers (lbs / kg)75,000 / 34,019
Engine Weight (lbs / kg)124,500 / 56,472
Tender Loaded Weight (lbs / kg)82,900 / 37,603
Total Engine and Tender Weight (lbs / kg)207,400 / 94,075
Tender Water Capacity (gals / ML)3600 / 13.64
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)63 / 31.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)72 / 1829
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)19" x 24" / 483x610
Tractive Effort (lbs / kg)18,411 / 8351.10
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.07
Heating Ability
Firebox Area (sq ft / m2)133.50 / 12.41
Grate Area (sq ft / m2)26.11 / 2.43
Evaporative Heating Surface (sq ft / m2)1687 / 156.78
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1687 / 156.78
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 area24,030
Power L16457
Power MT379.61

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