It's interesting to see that this locomotive had the same adhesion weight as did the L & A's only Consolidation. The difference was that this Ten-wheeler put that weight on one less axle. The design suited conditions well apparently because only one change was made on the series-production 4-6-0s that followed. See Locobase 6135.
Locobase 6134 showed the first Ten-wheeler for this railroad. This entry shows the 7 that followed in the same year. 171 introduced the slightly larger cylinder that was the biggest difference -- its weight was the same as the 170. But the 172-177 all weighed about 2 1/2 tons less -- was this a weight-reduction program? In all other respects, the design was the same as the 171.
The mixed-traffic 171 class shown in Locobase 6135 was joined three years later by this frankly freight octet. One -- 200 -- later had its cylinders bushed down to 19 1/4" for a commensurate drop in tractive effort. These freight haulers broke the 20 tons per axle mark.
Although still using saturated steam, these Ten-wheelers were the first with real size about them on the L & A. The axle loadings were reasonably dense, the boiler large, and the tractive effort promised some good medium-duty freight hauling. The first two had 192-sq ft fireboxes, the succeeding class had the slightly larger furnaces shown in the specs..
At the time of the book, these were the only superheated locomotives on the L & A. Freight haulers with some good power and among the largest Ten-wheelers being built in North America, they were now heavy enough to have broken the 25-ton axle loading level. Even so, they were probably a bit slippery.
| Specifications | |||||
|---|---|---|---|---|---|
| Class | 170 | 171 | 200 | 400 | 500 |
| Locobase ID | 6134 | 6135 | 6136 | 6138 | 6139 |
| Railroad | Louisiana & Arkansas | Louisiana & Arkansas | Louisiana & Arkansas | Louisiana & Arkansas | Louisiana & Arkansas |
| Whyte | 4-6-0 | 4-6-0 | 4-6-0 | 4-6-0 | 4-6-0 |
| Road Numbers | 170 | 171-177 | 200-207 | 400-405 | 500-501 |
| Gauge | Std | Std | Std | Std | Std |
| Builder | Burnham, Williams & Co | Burnham, Williams & Co | Burnham, Williams & Co | Baldwin | Baldwin |
| Year | 1903 | 1903 | 1906 | 1912 | 1916 |
| Valve Gear | Stephenson | Stephenson | Stephenson | Walschaert | Southern |
| Locomotive Length and Weight | |||||
| Driver Wheelbase | 14' | 14' | 14' | 14.83' | 14.83' |
| Engine Wheelbase | 24' | 24' | 24' | 25.50' | 25.50' |
| Ratio of driving wheelbase to overall engine wheebase | 0.58 | 0.58 | 0.58 | 0.58 | 0.58 |
| Overall Wheelbase (engine & tender) | 53.54' | 55.21' | 55.21' | 62.29' | 61.67' |
| Axle Loading (Maximum Weight per Axle) | 38668 lbs | 36995 lbs | 40350 lbs | 47150 lbs | 51600 lbs |
| Weight on Drivers | 114365 lbs | 109365 lbs | 119340 lbs | 139750 lbs | 153000 lbs |
| Engine Weight | 149397 lbs | 139085 lbs | 152000 lbs | 179000 lbs | 194000 lbs |
| Tender Light Weight | 104300 lbs | 115700 lbs | 115700 lbs | 149100 lbs | 143300 lbs |
| Total Engine and Tender Weight | 253697 lbs | 254785 lbs | 267700 lbs | 328100 lbs | 337300 lbs |
| Tender Water Capacity | 5000 gals | 5000 gals | 5000 gals | 7000 gals | 7000 gals |
| Tender Fuel Capacity (oil/coal) | 12 tons | 12 tons | 12 tons | 12 tons | 14 tons |
| Minimum weight per yard of rail on which locomotive could run | 63.54 lb rail | 60.76 lb rail | 66.30 lb rail | 77.64 lb rail | 85 lb rail |
| Geometry Relating to Tractive Effort | |||||
| Driver Diameter | 63" | 63" | 57" | 57" | 57" |
| Boiler Pressure | 180 psi | 180 psi | 200 psi | 200 psi | 200 psi |
| Cylinders (dia x stroke) | 19" x 26" | 20" x 26" | 20" x 26" | 21" x 28" | 22" x 28" |
| Tractive Effort | 22795 lbs | 25257 lbs | 31018 lbs | 36827 lbs | 40418 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.02 | 4.33 | 3.85 | 3.79 | 3.79 |
| Heating Ability | |||||
| Firebox Area | 166 sq. ft | 166 sq. ft | 165 sq. ft | 200 sq. ft | 200 sq. ft |
| Grate Area | 24.80 sq. ft | 24.80 sq. ft | 33.30 sq. ft | 34.30 sq. ft | 34.40 sq. ft |
| Evaporative Heating Surface | 2134 | 2134 | 2302 | 2900 | 2571 |
| Superheating Surface | 500 | ||||
| Combined Heating Surface | 2134 | 2134 | 2302 | 2900 | 3071 |
| Evaporative Heating Surface/Cylinder Volume | 250.11 | 225.73 | 243.50 | 258.36 | 208.70 |
| Computations Relating to Power Output (More Information) | |||||
| Robert LeMassena's Power Computation | 4464 | 4464 | 6660 | 6860 | 6880 |
| Same as above plus superheater percentage | 4464 | 4464 | 6660 | 6860 | 8000.16 |
| Same as above but substitute firebox area for grate area | 29880 | 29880 | 33000 | 40000 | 46512.54 |
| Power L1 | 6565.73 | 5925.58 | 6284.52 | 6601.54 | 12448.05 |
| Power MT | 379.70 | 358.35 | 348.29 | 312.43 | 538.10 |
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