South San Francisco Beltline 2-4-4 Locomotives in the USA


Class Details by Steve Llanso of Sweat House Media

Class 4 (Locobase 13706)

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 Sweat House Media
Class4
Locobase ID13,706
RailroadSouth San Francisco Beltline
CountryUSA
Whyte2-4-4ST
Number in Class1
Road Numbers4
GaugeStd
Number Built1
BuilderBaldwin
Year1910
Valve GearStephenson
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 wheebase 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)110,000
Tender Water Capacity (gals / ML)1600 / 6.06
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)800 / 3
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 / 11
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
Firebox Area (sq ft / m2)88.50 / 8.22
Grate Area (sq ft / m2)15 / 1.39
Evaporative Heating Surface (sq ft / m2)1068 / 99.22
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1068 / 99.22
Evaporative Heating Surface/Cylinder Volume191.22
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2400
Same as above plus superheater percentage2400
Same as above but substitute firebox area for grate area14,160
Power L13318
Power MT

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