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 time. Or, to note another comparison, the famous Civil War locomotive General, built in 1855, had almost identical dimensions.
And, yes, the factor of adhesion is measured correctly at 2.96 -- the diagram has the same number. This locomotive had to have been intended for the lightest rail possible ...
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 ...
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 ...
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.
| Specifications | ||||
|---|---|---|---|---|
| Class | 100 | 106 | 107 | 300 |
| Locobase ID | 6129 | 6130 | 6131 | 6137 |
| Railroad | Louisiana & Arkansas | Louisiana & Arkansas | Louisiana & Arkansas | Louisiana & Arkansas |
| Whyte | 4-4-0 | 4-4-0 | 4-4-0 | 4-4-0 |
| Road Numbers | 100 | 106, 107 | 107 | 300-303 |
| Gauge | Std | Std | Std | Std |
| Builder | Burnham, Williams & Co | C & A Railway | C & A Railway | Baldwin |
| Year | 1899 | 1896 | 1898 | 1911 |
| Valve Gear | Stephenson | Stephenson | Stephenson | Stephenson |
| Locomotive Length and Weight | ||||
| Driver Wheelbase | 7.33' | 8.67' | 8.67' | 8.50' |
| Engine Wheelbase | 21' | 23.17' | 23.17' | 22.58' |
| Ratio of driving wheelbase to overall engine wheebase | 0.35 | 0.37 | 0.37 | 0.38 |
| Overall Wheelbase (engine & tender) | 44.83' | 47.50' | 47.50' | 52.71' |
| Axle Loading (Maximum Weight per Axle) | 19000 lbs | 28500 lbs | 28500 lbs | 41800 lbs |
| Weight on Drivers | 38000 lbs | 57000 lbs | 57000 lbs | 83600 lbs |
| Engine Weight | 60000 lbs | 90000 lbs | 90000 lbs | 124500 lbs |
| Tender Light Weight | 82700 lbs | 66800 lbs | 66800 lbs | 115700 lbs |
| Total Engine and Tender Weight | 142700 lbs | 156800 lbs | 156800 lbs | 240200 lbs |
| Tender Water Capacity | 3600 gals | 2500 gals | 2500 gals | 5000 gals |
| Tender Fuel Capacity (oil/coal) | 8 tons | 8 tons | 8 tons | 12 tons |
| Minimum weight per yard of rail on which locomotive could run | 32 lb rail | 48 lb rail | 48 lb rail | 70 lb rail |
| Geometry Relating to Tractive Effort | ||||
| Driver Diameter | 57" | 63" | 64" | 67" |
| Boiler Pressure | 180 psi | 150 psi | 150 psi | 200 psi |
| Cylinders (dia x stroke) | 14.75" x 22" | 17" x 24" | 17" x 24" | 18" x 24" |
| Tractive Effort | 12848 lbs | 14037 lbs | 13818 lbs | 19730 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 2.96 | 4.06 | 4.13 | 4.24 |
| Heating Ability | ||||
| Firebox Area | 88 sq. ft | 110 sq. ft | 109 sq. ft | 133 sq. ft |
| Grate Area | 12.80 sq. ft | 16 sq. ft | 16 sq. ft | 25.60 sq. ft |
| Evaporative Heating Surface | 820 | 1072 | 1064 | 1867 |
| Superheating Surface | ||||
| Combined Heating Surface | 820 | 1072 | 1064 | 1867 |
| Evaporative Heating Surface/Cylinder Volume | 188.47 | 170.02 | 168.75 | 264.13 |
| Computations Relating to Power Output (More Information) | ||||
| Robert LeMassena's Power Computation | 2304 | 2400 | 2400 | 5120 |
| Same as above plus superheater percentage | 2304 | 2400 | 2400 | 5120 |
| Same as above but substitute firebox area for grate area | 15840 | 16500 | 16350 | 26600 |
| Power L1 | 4952 | 4052 | 4083 | 8000 |
| Power MT | 574.59 | 313.44 | 315.84 | 421.94 |
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