Atlantic Coast Line 4-4-2 "Atlantic" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class I-3 (Locobase 12445)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 23, p. 132. Works numbers 18368-18369 in November 1900.

A growth in cylinder volume was the principal difference betwen these two Atlantics of 1900 and the earlier 12 that gave the arrangement its name (see Locobase 1113). They were rated to take 10 cars up a 32 ft/mile grade (about 0.6%) at 40 mph.

Both were retired in April 1934.

Class I/I-2 (Locobase 1113)

Data from ACL's 1913 Locomotive Diagram supplied by Allen Stanley in May 2005 from his extensive Raildata collection. See also DeGolyer, Volume 19, p. 188.

Works numbers were 14180-14184, which were credited to several ACL constituents. In order, these were the Richmond & Petersburg (their 230), the Petersburg (265), two to the Wilmington & Weldon (151-152), and one to the Northeastern Railroad of North Carolina (10). The last two produced to the 19" x 24", 72"driver dimensions were produced in October 1897 (15530-15531) for the Wilmington & Weldon (155) and Petersburg (266), respectively. (A single Atlantic produced in August 1895 (works 14395) was numbered 153 on the Wilmington & Weldon.

First true Atlantic built for US service. Although other 4-4-2s had appeared earlier, this design included the larger firebox that was the rationale for the extra, 42" (1,067 mm) diameter trailing truck. The specs called for the ability to haul ten passenger coaches up a 32 foot grade at 40 mph (64 km/h). Baldwin estimated adhesion weight at 65,000 lb (29,484 kg) and engine weight at approximately 120,000 lb (54,431 kg).

The 1913 Diagram book shows several subclasses; these probably reflect the different railroads of origin.. The 1942 edition shows a slightly larger firebox with 14 sq ft of fire brick tubes. It also notes that Baldwin delivered locomotives in 1894-95 and in 1896-1897.

Specifications by Steve Llanso of Sweat House Media
Locobase ID12,445 1113
RailroadAtlantic Coast Line (ACL)Atlantic Coast Line (ACL)
Number in Class212
Road Numbers210-211 / 98-9988-97
Number Built212
BuilderBurnham, Williams & CoBurnham, Williams & Co
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft) 6.25 6.25
Engine Wheelbase (ft)23.6723.83
Ratio of driving wheelbase to overall engine wheebase 0.26 0.26
Overall Wheelbase (engine & tender) (ft)50.33
Axle Loading (Maximum Weight per Axle) (lbs)40,750
Weight on Drivers (lbs)73,00075,990
Engine Weight (lbs)130,000129,620
Tender Loaded Weight (lbs)82,00082,800
Total Engine and Tender Weight (lbs)212,000212,420
Tender Water Capacity (gals)40003600
Tender Fuel Capacity (oil/coal) (gals/tons)
Minimum weight of rail (calculated) (lb/yd)6163
Geometry Relating to Tractive Effort
Driver Diameter (in)7372
Boiler Pressure (psi)180180
High Pressure Cylinders (dia x stroke) (in)19" x 26"19" x 24"
Tractive Effort (lbs)19,67218,411
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.71 4.13
Heating Ability
Firebox Area (sq ft)133.50161
Grate Area (sq ft)26.1026.10
Evaporative Heating Surface (sq ft)20472086
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)20472086
Evaporative Heating Surface/Cylinder Volume239.92264.86
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation46984698
Same as above plus superheater percentage46984698
Same as above but substitute firebox area for grate area24,03028,980
Power L169687929
Power MT420.87460.07


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