Louisiana & Arkansas 4-4-0 "American" Locomotives in the USA

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Class Details by Steve Llanso of Sweat House Media

Class 106 (Locobase 6130)

Data from 1918 USRA diagram book of L&A locomotives supplied by Allen Stanley in March 2004.

Obviously, the USRA found a railroad with a mixture of locomotive heritages. Can't say what the C&A Railway was or why they chose to build these locomotives. The specs are for 106. 107, built by the C&A two years later, had slightly different heating surface areas (although the tube count was the same). Both were definitely on the small side ...


Class 107 (Locobase 6131)

Data from 1918 USRA diagram book of L&A locomotives supplied by Allen Stanley in March 2004.

Obviously, the USRA found a railroad with a mixture of locomotive heritages. Can't say what the C&A Railway was or why they chose to build this locomotive. It was definitely on the small side ...


Class 300 (Locobase 6137)

Data from 1918 USRA diagram book of L&A locomotives supplied by Allen Stanley in March 2004 from his extensive Rail Data Exchange. See also Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 36, p. 48 and Volume 40, p. 121. (Thanks to Chris Hohl for his 18 March 2016 email reporting the earlier of the two Baldwin specs entries and for noting the original coal capacity.) Works numbers ran 36050-36051 in February 1911 and 37712-37713 in April.

Some more eight-wheelers joining the L & A relatively late in that arrangement's history. Small locomotives, but with a relatively large boiler and high axle loading. A provision in the specs required that the cylinders have enough metal to allow reboring. Also, a note about boiler tubes seems awfully diffident: ""Bottom Flues to be 5" [127 mm] from bottom of boiler. (Co. does not insist upon this but leave matter to the judgement of BLW.)"

Baldwin's specification advises that "Particular attention to be paid to painting." Murphy Varnish Company supplied the paint and varnish. Lettering and striping was to be the railroad company's standard aluminum, but Baldwin would apply "Stay-bright" or a Graphite paint to cover the smoke box, fire box, and ash pan.

The "roomy" cab had a large ventilator in the roof and a large window on each side fitted with double-strength glass.

Frames were to "withstand heavy service" so the bars were 4" (102 mm) wide and braced "where possible to insure stiffness." A Hereafter note in the specs for the first two engines dated 28 March 1911 said to "omit spark hopper and cleaning hole and cap" and for the injector to be located outside of the cab. In the later spec, the injectors were to be fitted with "extension handles convenient for engineer and fireman."

As delivered, the tenders carried the 10 tons shown in the specs. By the time the USRA compiled data in 1918, however, capacity had increased to 12 tons (10.9 tonnes) and loaded tender weight grew to 115,701 lb (52,481 kg).

301 ended its days in a wreck in November 1936. By that time 300 and 303 had been scrapped (March and May of 1935, respectively). 302 carried on solo until it was taken out of service in 1941 and scrapped in November.

Specifications by Steve Llanso of Sweat House Media
Class106107300
Locobase ID6130 6131 6137
RailroadLouisiana & ArkansasLouisiana & ArkansasLouisiana & Arkansas
CountryUSAUSAUSA
Whyte4-4-04-4-04-4-0
Number in Class214
Road Numbers106, 107107300-303
GaugeStdStdStd
Number Built214
BuilderC&A RailwayC & A RailwayBaldwin
Year189618981911
Valve GearStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 8.67 / 2.64 8.67 / 2.64 8.50 / 2.59
Engine Wheelbase (ft / m)23.17 / 7.0623.17 / 7.0622.58 / 6.88
Ratio of driving wheelbase to overall engine wheebase 0.37 0.37 0.38
Overall Wheelbase (engine & tender) (ft / m)47.50 / 14.4847.50 / 14.4852.72 / 16.07
Axle Loading (Maximum Weight per Axle) (lbs / kg)28,500 / 12,92728,500 / 12,92741,800 / 18,960
Weight on Drivers (lbs / kg)57,000 / 25,85557,000 / 25,85583,600 / 37,920
Engine Weight (lbs / kg)90,000 / 40,82390,000 / 40,823124,500 / 56,472
Tender Loaded Weight (lbs / kg)66,800 / 30,30066,800 / 30,300100,000 / 45,359
Total Engine and Tender Weight (lbs / kg)156,800 / 71,123156,800 / 71,123224,500 / 101,831
Tender Water Capacity (gals / ML)2500 / 9.472500 / 9.475000 / 18.94
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)8 / 7.308 / 7.3010 / 10.90
Minimum weight of rail (calculated) (lb/yd / kg/m)48 / 2448 / 2470 / 35
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)63 / 160064 / 162667 / 1702
Boiler Pressure (psi / kPa)150 / 10.30150 / 10.30200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)17" x 24" / 432x61017" x 24" / 432x61018" x 24" / 457x610
Tractive Effort (lbs / kg)14,037 / 6367.0813,818 / 6267.7519,730 / 8949.39
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.06 4.13 4.24
Heating Ability
Firebox Area (sq ft / m2)110 / 10.22109 / 10.13133 / 12.36
Grate Area (sq ft / m2)16 / 1.4916 / 1.4925.60 / 2.38
Evaporative Heating Surface (sq ft / m2)1072 / 99.631064 / 98.881867 / 173.45
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1072 / 99.631064 / 98.881867 / 173.45
Evaporative Heating Surface/Cylinder Volume170.02168.75264.13
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation240024005120
Same as above plus superheater percentage240024005120
Same as above but substitute firebox area for grate area16,50016,35026,600
Power L1405240838000
Power MT313.44315.84421.94