Philadelphia & Atlantic City 4-4-2 "Atlantic" Locomotives in 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.

Principal Dimensions 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 (ft / m) 7.25 / 2.21
Engine Wheelbase (ft / m)26.58 / 8.10
Ratio of driving wheelbase to overall engine wheebase 0.27
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)40,000 / 18,144
Weight on Drivers (lbs / kg)79,000 / 35,834
Engine Weight (lbs / kg)142,900 / 64,818
Tender Loaded Weight (lbs / kg)84,100 / 38,147
Total Engine and Tender Weight (lbs / kg)227,000 / 102,965
Tender Water Capacity (gals / ML)3300 / 12.50
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)7 / 6.40
Minimum weight of rail (calculated) (lb/yd / kg/m)66 / 33
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)84.25 / 2140
Boiler Pressure (psi / kPa)200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)13" x 26" / 330x660
Low Pressure Cylinders (dia x stroke) (in / mm)22" x 26" / 559x660
Tractive Effort (lbs / kg)13,143 / 5961.57
Factor of Adhesion (Weight on Drivers/Tractive Effort) 6.01
Heating Ability
Firebox Area (sq ft / m2)190.20 / 17.67
Grate Area (sq ft / m2)76 / 7.06
Evaporative Heating Surface (sq ft / m2)1836 / 170.57
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1836 / 170.57
Evaporative Heating Surface/Cylinder Volume459.66
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation15,200
Same as above plus superheater percentage15,200
Same as above but substitute firebox area for grate area38,040
Power L16842
Power MT381.87

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