Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 36, p. 99. Works number was 34845 in June 1910.
This powerful little oil-burning tank repeated the Western Meat Company design delivered by Baldwin in 1904 (See Locobase 16326.). It served the SSFB transfer line for years on its 70-lb/yard (35-kg/metre) rail. The two-mile long SSFB supported development in the South San Francisco area.
The 4 was sold to Algoma Lumber. Algoma sold the engine to the Modesto & Empire Traction Company in July 1942 as their #8. Nicknamed "Jeep", the 8 gave good wartime service before being scrapped in 1948.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 4 |
| Locobase ID | 13706 |
| Railroad | South San Francisco Beltline |
| Country | USA |
| Whyte | 2-4-4ST |
| Number in Class | 1 |
| Road Numbers | 4 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1910 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 7.50 / 2.29 |
| Engine Wheelbase (ft / m) | 28.58 / 8.71 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.26 |
| Overall Wheelbase (engine & tender) (ft / m) | 28.58 / 8.71 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 75,000 / 34,019 |
| Engine Weight (lbs / kg) | 110,000 / 49,895 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 1600 / 6.06 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 800 / 3028 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 46 / 1168 |
| Boiler Pressure (psi / kPa) | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 16" x 24" / 406x610 |
| Tractive Effort (lbs / kg) | 18,165 / 8239.52 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.13 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 157 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 12 / 3.66 |
| Firebox Area (sq ft / m2) | 88.50 / 8.22 |
| Grate Area (sq ft / m2) | 15 / 1.39 |
| Evaporative Heating Surface (sq ft / m2) | 1068 / 99.26 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1068 / 99.26 |
| Evaporative Heating Surface/Cylinder Volume | 191.06 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2400 |
| Same as above plus superheater percentage | 2400 |
| Same as above but substitute firebox area for grate area | 14,160 |
| Power L1 | 3315 |
| Power MT | |