Winston-Salem Southbound 4-8-0 "Mastodon" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class M (Locobase 13675)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 35, p. 231. See also the North Carolina Rails account at, last accessed 6 January 2012. Works numbers were 35858-35861 in January 1911.

The WSSB was jointly owned by the Norfolk & Western and the Atlantic Coast Line and linked the N & W's line at Winston-Salem, NC with that of the ACL, 90.2 miles (145.2 km) distant at Wadesboro. The line was originally conceived for very local operations, but its first practical sponsor was the Southern Railway. Although chartered in 1905, it wasn't until the brothers HE and Francis Fries persuaded the N & W to buy the Southern's share and bring the ACL on board in a 50/50 partnership in 1909 that construction actually began.

The first passenger train left Winston-Salem for Whitney on 17 December 1910. These "Mollies", exact duplicates of the Norfolk & Western Twelve-wheelers shown in Locobase 2501. Thus they probably also suffered from the same mis-alignment in the valve gear described by Thomas Dressler in that entry.

The WSSB dieselized in 1957.

Specifications by Steve Llanso of Sweat House Media
Locobase ID13675
RailroadWinston-Salem Southbound
Number in Class4
Road Numbers200-203
Number Built4
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase15.50'
Engine Wheelbase26.42'
Ratio of driving wheelbase to overall engine wheebase 0.59
Overall Wheelbase (engine & tender)53.58'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers168000 lbs
Engine Weight200000 lbs
Tender Light Weight116600 lbs
Total Engine and Tender Weight316600 lbs
Tender Water Capacity6000 gals
Tender Fuel Capacity (oil/coal)10 tons
Minimum weight of rail (calculated)70 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter56"
Boiler Pressure200 psi
Cylinders (dia x stroke)21" x 30"
Tractive Effort40163 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.18
Heating Ability
Firebox Area150 sq. ft
Grate Area44.50 sq. ft
Evaporative Heating Surface2760 sq. ft
Superheating Surface
Combined Heating Surface2760 sq. ft
Evaporative Heating Surface/Cylinder Volume229.49
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation8900
Same as above plus superheater percentage8900
Same as above but substitute firebox area for grate area30000
Power L15448
Power MT285.97

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