Arkansas, Louisiana & Southern 4-4-0 "American" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 3 (Locobase 12322)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 21, p.253. Works number was 16436 in January 1899.

Class 3/100 (Locobase 6129)

Data from DeGolyer, Volume 22, p. 36. See also 1918 USRA diagram book of L&A locomotives supplied by Allen Stanley in March 2004. Works number was 16436 in January 1899.

It's hard to believe this was a standard-gauge locomotive on American rails at the turn of the century. It was one of the lightest and least powerful eight-wheelers of the time. Or, to note another comparison, the famous Civil War locomotive General, built in 1855, had almost identical dimensions. The improbably low factor of adhesion can't be contradicted either by the Baldwin entry or the later USRA diagram.

The USRA diagram showed cylinder diameters of 14 3/4" (375 mm) and driver diameters of 57" (1,448 mm). A larger tender carried 3,600 US gallons (13,640 litres) of water and 8 tons (7.3 tonnes) of coal; its loaded weight was listed as 82,700 lb (37,512 kg).

The 100 was scrapped in January 1926.

Specifications by Steve Llanso of Sweat House Media
Locobase ID12,322 6129
RailroadArkansas, Louisiana & SouthernArkansas, Louisiana & Southern
Number in Class11
Road Numbers3 / 1003/100
Number Built11
BuilderBurnham, Williams & CoBurnham, Williams & Co
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft) 7.33 7.33
Engine Wheelbase (ft)20.9621
Ratio of driving wheelbase to overall engine wheebase 0.35 0.35
Overall Wheelbase (engine & tender) (ft)44.83
Axle Loading (Maximum Weight per Axle) (lbs)19,000
Weight on Drivers (lbs)39,00038,000
Engine Weight (lbs)61,00060,000
Tender Loaded Weight (lbs)50,000
Total Engine and Tender Weight (lbs)110,000
Tender Water Capacity (gals)25002500
Tender Fuel Capacity (oil/coal) (gals/tons)
Minimum weight of rail (calculated) (lb/yd)3332
Geometry Relating to Tractive Effort
Driver Diameter (in)5454
Boiler Pressure (psi)180180
High Pressure Cylinders (dia x stroke) (in)14" x 22"14" x 22"
Tractive Effort (lbs)12,21712,217
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.19 3.11
Heating Ability
Firebox Area (sq ft)7979
Grate Area (sq ft)12.8012.80
Evaporative Heating Surface (sq ft)799799
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)799799
Evaporative Heating Surface/Cylinder Volume203.84203.84
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation23042304
Same as above plus superheater percentage23042304
Same as above but substitute firebox area for grate area14,22014,220
Power L149354935
Power MT557.94572.62

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.