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.
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|
|Railroad||Atlantic Coast Line (ACL)||Atlantic Coast Line (ACL)|
|Number in Class||2||12|
|Road Numbers||210-211 / 98-99||88-97|
|Builder||Burnham, Williams & Co||Burnham, Williams & Co|
|Locomotive Length and Weight|
|Driver Wheelbase (ft)||6.25||6.25|
|Engine Wheelbase (ft)||23.67||23.83|
|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)||73,000||75,990|
|Engine Weight (lbs)||130,000||129,620|
|Tender Loaded Weight (lbs)||82,000||82,800|
|Total Engine and Tender Weight (lbs)||212,000||212,420|
|Tender Water Capacity (gals)||4000||3600|
|Tender Fuel Capacity (oil/coal) (gals/tons)|
|Minimum weight of rail (calculated) (lb/yd)||61||63|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in)||73||72|
|Boiler Pressure (psi)||180||180|
|High Pressure Cylinders (dia x stroke) (in)||19" x 26"||19" x 24"|
|Tractive Effort (lbs)||19,672||18,411|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||3.71||4.13|
|Firebox Area (sq ft)||133.50||161|
|Grate Area (sq ft)||26.10||26.10|
|Evaporative Heating Surface (sq ft)||2047||2086|
|Superheating Surface (sq ft)|
|Combined Heating Surface (sq ft)||2047||2086|
|Evaporative Heating Surface/Cylinder Volume||239.92||264.86|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||4698||4698|
|Same as above plus superheater percentage||4698||4698|
|Same as above but substitute firebox area for grate area||24,030||28,980|