Atlantic Coast Line 4-4-2 "Atlantic" Locomotives in 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 Rail Data Exchange. 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.

Principal Dimensions by Steve Llanso of Sweat House Media
ClassI-3I/I-2
Locobase ID12,445 1113
RailroadAtlantic Coast Line (ACL)Atlantic Coast Line (ACL)
CountryUSAUSA
Whyte4-4-24-4-2
Number in Class212
Road Numbers210-211 / 98-9988-97
GaugeStdStd
Number Built212
BuilderBurnham, Williams & CoBurnham, Williams & Co
Year19001894
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 6.25 / 1.90 6.25 / 1.90
Engine Wheelbase (ft / m)23.67 / 7.2123.83 / 7.26
Ratio of driving wheelbase to overall engine wheebase 0.26 0.26
Overall Wheelbase (engine & tender) (ft / m)50.33 / 15.34
Axle Loading (Maximum Weight per Axle) (lbs / kg)40,750 / 18,484
Weight on Drivers (lbs / kg)73,000 / 33,11275,990 / 34,469
Engine Weight (lbs / kg)130,000 / 58,967129,620 / 58,795
Tender Loaded Weight (lbs / kg)82,000 / 37,19582,800 / 37,557
Total Engine and Tender Weight (lbs / kg)212,000 / 96,162212,420 / 96,352
Tender Water Capacity (gals / ML)4000 / 15.153600 / 13.64
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)61 / 30.5063 / 31.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)73 / 185472 / 1829
Boiler Pressure (psi / kPa)180 / 12.40180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)19" x 26" / 483x66019" x 24" / 483x610
Tractive Effort (lbs / kg)19,672 / 8923.0818,411 / 8351.10
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.71 4.13
Heating Ability
Firebox Area (sq ft / m2)133.50 / 12.41161 / 14.96
Grate Area (sq ft / m2)26.10 / 2.4326.10 / 2.42
Evaporative Heating Surface (sq ft / m2)2047 / 190.242086 / 193.79
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2047 / 190.242086 / 193.79
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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