Atlantic Coast Line 0-4-0 "Switcher" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 434 (Locobase 15033)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 27, p. 206. See also Fowler (Ed.), 1912 Locomotive Cyclopedia (New York: Simmons-Boardman Co, 1912), pp. 156. (Thanks to Chris Hohl for his 8 February 2015 email informing Locobase of the coal capacity and a corrected engine weight, citing []). Baldwin works numbers were 25242 in March 1905 and 37913 in June 1912.

Fully enclosed as were most steam dummies, this packed a heftier power package than most such motive power units. Its tramcar-like body had six windows on each side, a short wheelbase and cylinder tucked under the floor, and the smokebox poking out through the front door and the stack sticking up through the roof.

According to Gene Connelly's Baldwin production file, both locomotives remained in service for decades. 1434 was scrapped in June 1950 and 1435 in July 1951.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID15033
RailroadAtlantic Coast Line (ACL)
Number in Class2
Road Numbers434-435 / 1434-1435
Number Built2
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 6.50 / 1.98
Engine Wheelbase (ft / m) 6.50 / 1.98
Ratio of driving wheelbase to overall engine wheelbase1
Overall Wheelbase (engine & tender) (ft / m) 6.50 / 1.98
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)95,380 / 43,264
Engine Weight (lbs / kg)95,380 / 43,264
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)1250 / 4.73
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 0.65 / 1
Minimum weight of rail (calculated) (lb/yd / kg/m)79 / 39.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1118
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)17" x 24" / 432x610
Tractive Effort (lbs / kg)24,118 / 10939.75
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.95
Heating Ability
Tubes (number - dia) (in / mm)191 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 8.29 / 2.53
Firebox Area (sq ft / m2)80.10 / 7.44
Grate Area (sq ft / m2)20.20 / 1.88
Evaporative Heating Surface (sq ft / m2)798 / 74.14
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)798 / 74.14
Evaporative Heating Surface/Cylinder Volume126.47
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3636
Same as above plus superheater percentage3636
Same as above but substitute firebox area for grate area14,418
Power L12507
Power MT115.89

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