Philadelphia & Atlantic City 4-4-2 "Atlantic" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 1026 / P1-b (Locobase 2562)

Data from DeGolyer, Volume 20, p. 91. See also "Express Locomotive for the Atlantic City Railroad," Engineering, Volume 64 (16 September 1897) , pp. 351, 357. (Thanks to Chris Hohl for his 25 January 2015 email pointing out the improbability of a tender coal capacity of 76 tons.) Works numbers were 14739-14740 in March 1896 and 15878-15879 in April 1898.

The recently developed Atlantic wheel arrangement permitted larger fireboxes behind the drivers. When the railroad in question was burning anthracite, which needed even bigger grates, the result was the Camelback. Camelbacks separated the engine crew, putting the engineer high on the boiler and over the drivers and the fireman behind the huge Wooten firebox. These ACR engines were Vauclain compounds in which the high and low pressure cylinders shared a common valve gear.

The result was a Flier, posting speeds of 90+ mph and averaging 71 mph between Philadelphia and Atlantic City. On one run in August 1897, 1027 averaged 69.3 mph pulling a train that carried 448 passengers. Both the Atlantic City and parent Philadelphia & Reading ordered more of this design. See Locobase 15924 for the Readings.

Specifications by Steve Llanso of Sweat House Media
Class1026 / P1-b
Locobase ID2562
RailroadPhiladelphia & Atlantic City (Reading)
Number in Class4
Road Numbers1026-1029
Number Built4
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase 7.25'
Engine Wheelbase26.58'
Ratio of driving wheelbase to overall engine wheebase 0.27
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)40000 lbs
Weight on Drivers79000 lbs
Engine Weight142900 lbs
Tender Light Weight84100 lbs
Total Engine and Tender Weight227000 lbs
Tender Water Capacity3300 gals
Tender Fuel Capacity (oil/coal)7 tons
Minimum weight of rail (calculated)66 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter84.25"
Boiler Pressure200 psi
High Pressure Cylinders (dia x stroke)13" x 26"
Low Pressure Cylinders (dia x stroke)22" x 26" (2)
Tractive Effort13143 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 6.01
Heating Ability
Firebox Area190.20 sq. ft
Grate Area76 sq. ft
Evaporative Heating Surface1836 sq. ft
Superheating Surface
Combined Heating Surface1836 sq. ft
Evaporative Heating Surface/Cylinder Volume459.66
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation15200
Same as above plus superheater percentage15200
Same as above but substitute firebox area for grate area38040
Power L16842
Power MT381.87

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