The firebox heating surface includes 107 sq ft of thermic syphons and 104 sq ft in the combustion chamber. Piston valves measured 14" in diameter. The StL-SW diagram shows that of the driving wheelbase, only 12 ft 2" was considered "rigid", meaning the lead driving axle had considerabl lateral play. The frame and cylinders were combined in a integral steel casting. 800-804 truck bearings were Timken rollers while 805-809 ran SKFs. Later, all 10 were refitted with Boxpok drivers and Timken roller bearings on all driving journals.
The first 10 were built by Baldwin in 1930 and increased freight power by 30% while moving it faster.
Pine Bluff, the Frisco's main shop location, built its own variant; see Locobase 8479.
The first 10 Northerns on the StL-SW came from Baldwin in 1930 and they're described in Locobase 245. In this entry, we show the second 10, which were produced by Pine Bluff, the Frisco's main shop location, beginning in 1937. These had roller bearings on all axles and Boxpok drivers. Also, the superheater lost 98 sq ft of heating surface, probably by eliminating elements from a few 3 1/2" flues, as the tube and flue counts remained the same at 52 and 200, respectively.
The Baldwin engines were modified to a similar standard and Pine Bluff supplied another 5 engines to support wartime traffic in 1942.
| Specifications | ||
|---|---|---|
| Class | L1 - 800 | L1 - 810 |
| Locobase ID | 254 | 8479 |
| Railroad | Cotton Belt (StLSW) | Cotton Belt (StLSW) |
| Whyte | 4-8-4 | 4-8-4 |
| Road Numbers | 800-809 | 810-819 |
| Gauge | Std | Std |
| Builder | Baldwin | Pine Bluff |
| Year | 1930 | 1937 |
| Valve Gear | Walschaert | Walschaert |
| Locomotive Length and Weight | ||
| Driver Wheelbase | 18.75' | 18.75' |
| Engine Wheelbase | 45' | 45' |
| Ratio of driving wheelbase to overall engine wheebase | 0.42 | 0.42 |
| Overall Wheelbase (engine & tender) | 87.58' | |
| Axle Loading (Maximum Weight per Axle) | 61500 lbs | 62000 lbs |
| Weight on Drivers | 242500 lbs | 248000 lbs |
| Engine Weight | 422500 lbs | 425500 lbs |
| Tender Light Weight | 307000 lbs | 312000 lbs |
| Total Engine and Tender Weight | 729500 lbs | 737500 lbs |
| Tender Water Capacity | 15000 gals | 15000 gals |
| Tender Fuel Capacity (oil/coal) | 5000 gals | 5000 gals |
| Minimum weight per yard of rail on which locomotive could run | 101.04 lb rail | 103.33 lb rail |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter | 70" | 70" |
| Boiler Pressure | 250 psi | 250 psi |
| Cylinders (dia x stroke) | 26" x 30" | 26" x 30" |
| Tractive Effort | 61564 lbs | 61564 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.94 | 4.03 |
| Heating Ability | ||
| Firebox Area | 469 sq. ft | 469 sq. ft |
| Grate Area | 88.30 sq. ft | 88.30 sq. ft |
| Evaporative Heating Surface | 4728 | 4728 |
| Superheating Surface | 2060 | 1962 |
| Combined Heating Surface | 6788 | 6690 |
| Evaporative Heating Surface/Cylinder Volume | 256.47 | 256.47 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 22075 | 22075 |
| Same as above plus superheater percentage | 28774.25 | 28549.01 |
| Same as above but substitute firebox area for grate area | 152832.65 | 151636.32 |
| Power L1 | 40523.15 | 39127.71 |
| Power MT | 1473.62 | 1391.32 |
| This page last modified: . | [Contact] | All material © 1999-2008 SteamLocomotive.com |