Firebox had combustion chamber; 28 sq ft of arch tubes contributed to firebox heating surface area. Based on the USRA light Mountain design that saw service throughout the L&N system except for the Gulf Coast west of Mobile. At least 5 of the class received modifications in which 2 of the 4 arch tubes were removed (leaving 14 sq ft) and replaced by 3 thermic syphons measuring a total of 65 sq ft. Total firebox area came to 399 sq ft and total evaporative heating surface rose to 4,007 sq ft.
Charles B Castner in Drury (1993) tells us that the Mountains stepped right into heavy mainline passenger service between Cincinnati and Atlanta with some trains continuing on to Birmingham. Barred by bridge loading limits from operating further south, the 4-8-2s later added Louisville-East St Louis trains and even freights. They saw out steam on the L & N, retiring in the mid-1950s.
| Specifications | |
|---|---|
| Class | L-1 |
| Locobase ID | 209 |
| Railroad | Louisville & Nashville (L & N) |
| Whyte | 4-8-2 |
| Road Numbers | 400-421 |
| Gauge | Std |
| Builder | Baldwin |
| Year | 1926 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 18.25' |
| Engine Wheelbase | 40' |
| Ratio of driving wheelbase to overall engine wheebase | 0.46 |
| Overall Wheelbase (engine & tender) | 75.70' |
| Axle Loading (Maximum Weight per Axle) | 57400 lbs |
| Weight on Drivers | 223950 lbs |
| Engine Weight | 333100 lbs |
| Tender Light Weight | 194000 lbs |
| Total Engine and Tender Weight | 527100 lbs |
| Tender Water Capacity | 10000 gals |
| Tender Fuel Capacity (oil/coal) | 16 tons |
| Minimum weight per yard of rail on which locomotive could run | 93 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 69" |
| Boiler Pressure | 200 psi |
| Cylinders (dia x stroke) | 27" x 30" |
| Tractive Effort | 53883 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.16 |
| Heating Ability | |
| Firebox Area | 348 sq. ft |
| Grate Area | 70.80 sq. ft |
| Evaporative Heating Surface | 3956 |
| Superheating Surface | 1087 |
| Combined Heating Surface | 5043 |
| Evaporative Heating Surface/Cylinder Volume | 198.99 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 14160 |
| Same as above plus superheater percentage | 17275 |
| Same as above but substitute firebox area for grate area | 84912 |
| Power L1 | 17908 |
| Power MT | 705.16 |
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