Firebox fitted with combustion chamber, which contributed to the firebox heating surface area as did 14 sq ft of arch tubes and 73 sq ft of thermic syphons. These were the standard USRA Light Mountain design. According to Charles B Castner, writing in Drury (1993), these J1s were immediately successful on the Chattanooga Division. Baldwin delivered 8 more with revised boilers and fireboxes in 1922 and 1925; see Locobase 212.
Although bumped from the premium runs by the J2 and J3 4-8-4s, the class ran until 1949-1951.
After Alco's Richmond works supplied 5 USRA Light Mountain locomotives to the N, C & St L in 1919 (see Locobase 8329). When the 4-8-2 proved its worth, the road turned to Baldwin for more Mountains. Although the power dimensions were the same, the boiler saw a drop in small tubes in favor of more superheater flues. The firebox fitted with combustion chamber, which contributed to the firebox heating surface area as did 14 sq ft of arch tubes and 76 sq ft of thermic syphons.
They served the N, C & St L for more than 20 years.
| Specifications | ||
|---|---|---|
| Class | J-1a | J-1b/c |
| Locobase ID | 8329 | 212 |
| Railroad | Nashville, Chattanooga & St. Louis | Nashville, Chattanooga & St. Louis |
| Whyte | 4-8-2 | 4-8-2 |
| Road Numbers | 550-554 | 555-562 |
| Gauge | Std | Std |
| Builder | Alco-Richmond | Baldwin |
| Year | 1919 | 1922 |
| Valve Gear | Walschaert | Walschaert |
| Locomotive Length and Weight | ||
| Driver Wheelbase | 18.25' | 18.25' |
| Engine Wheelbase | 40' | 40' |
| Ratio of driving wheelbase to overall engine wheebase | 0.46 | 0.46 |
| Overall Wheelbase (engine & tender) | 75.83' | 77.33' |
| Axle Loading (Maximum Weight per Axle) | ||
| Weight on Drivers | 224500 lbs | 224500 lbs |
| Engine Weight | 327000 lbs | 340000 lbs |
| Tender Light Weight | 192000 lbs | 192000 lbs |
| Total Engine and Tender Weight | 519000 lbs | 532000 lbs |
| Tender Water Capacity | 10000 gals | 10000 gals |
| Tender Fuel Capacity (oil/coal) | 16 tons | 16 tons |
| Minimum weight per yard of rail on which locomotive could run | 93.54 lb rail | 93.54 lb rail |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter | 69" | 69" |
| Boiler Pressure | 200 psi | 200 psi |
| Cylinders (dia x stroke) | 27" x 30" | 27" x 30" |
| Tractive Effort | 53883 lbs | 53883 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.17 | 4.17 |
| Heating Ability | ||
| Firebox Area | 408 sq. ft | 411 sq. ft |
| Grate Area | 70.30 sq. ft | 70.30 sq. ft |
| Evaporative Heating Surface | 4181 | 4039 |
| Superheating Surface | 966 | 1080 |
| Combined Heating Surface | 5147 | 5119 |
| Evaporative Heating Surface/Cylinder Volume | 210.31 | 203.17 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 14060 | 14060 |
| Same as above plus superheater percentage | 16698.81 | 17026.36 |
| Same as above but substitute firebox area for grate area | 96914.86 | 99542.45 |
| Power L1 | 17255.45 | 18295.52 |
| Power MT | 677.80 | 718.66 |
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