Winston-Salem Southbound 4-8-0 "Mastodon" Locomotives in 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.

Principal Dimensions 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 Wheelbase (ft / m)15.50 / 4.72
Engine Wheelbase (ft / m)26.42 / 8.05
Ratio of driving wheelbase to overall engine wheelbase 0.59
Overall Wheelbase (engine & tender) (ft / m)53.58 / 16.33
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)168,000 / 76,204
Engine Weight (lbs / kg)200,000 / 90,719
Tender Loaded Weight (lbs / kg)116,600 / 52,889
Total Engine and Tender Weight (lbs / kg)316,600 / 143,608
Tender Water Capacity (gals / ML)6000 / 22.73
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)10 / 9
Minimum weight of rail (calculated) (lb/yd / kg/m)70 / 35
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)56 / 1422
Boiler Pressure (psi / kPa)200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)21" x 30" / 533x762
Tractive Effort (lbs / kg)40,163 / 18217.65
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.18
Heating Ability
Tubes (number - dia) (in / mm)242 - 2.25" / 57
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)18.41 / 5.61
Firebox Area (sq ft / m2)150 / 13.94
Grate Area (sq ft / m2)44.50 / 4.13
Evaporative Heating Surface (sq ft / m2)2760 / 256.41
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2760 / 256.41
Evaporative Heating Surface/Cylinder Volume229.43
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 area30,000
Power L15446
Power MT285.87

  • 201 (7/10/36 Winston-Salem, NC photo by William Monypeny courtesy Carl Weber)
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Wes Barris