Philadelphia & Reading 2-8-8-2 "Chesapeake" Locomotives in the USA

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Class Details by Steve Llanso of Sweat House Media

Class N1-sa/-sb, sc, sd (Locobase 326)

Data from RDG 11 - 1926 Locomotive Diagram book and various editions of the Reading Equipment Lists supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also DeGolyer, Volume 58, pp. 377+ and 387+. (Thanks to Chris Hohl, whose September 2012 email alerted me to the ambiguities in the original entry, and for his 30 January 2016 email noting tender differences, sb and sc number series, and a typo in a reference to the sc. Also, thanks to Nate Kelly for his 2 March 2017 email highlighting the differences in the N1-sd, which led to a revision of the version identification in this original Locobase 326 entry.) Works numbers were:


January 44890; February 45058, 45118; March 45278-45279, 45341


June 48941, 49088; July 49238, 49349; August 49487, 49546; September 49735; October 50133; December 50875, 50940


January 51080; February 51203, 51406; March 51515; April 51648, 51715; May 51769, 51827; June 51905, 51939, 51975, 51993, July 52073, 52095; August 52238

Thirty-one engines built for the Reading from 1917 to 1919. Wootten firebox heating surface included 94 sq ft (8.7 sq m) of arch tubes and syphons. This was one of the biggest examples of details that the Baldwin specification stated should be the same as those on the M-1sb Mikados shown in Locobase 9548.

Even with the enormous grate and combustion chamber, these engines were still short of breath. Their duty included pushing service on some of the Reading's 3% grades and heavy traffic.

The class was broken up in the late 1920s when the first eleven engines were converted to K1-sa and K1-sc Santa Fe-type 2-10-2s; see Locobase 83. The remaining compounds were redesignated N1-sb (1816-1830) if they had Standard stokers and N1-sc (1811-1815) if they used the Street Duplex stoker.

All of the twenty remaining engines were eventually rebuilt as N1-sd simple-expansion articulateds; see Locobase 16269.

Specifications by Steve Llanso of Sweat House Media
ClassN1-sa/-sb, sc, sd
Locobase ID326
RailroadPhiladelphia & Reading
Number in Class31
Road Numbers1800-1830
Number Built31
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)15 / 4.57
Engine Wheelbase (ft / m)55.83 / 17.02
Ratio of driving wheelbase to overall engine wheebase 0.27
Overall Wheelbase (engine & tender) (ft / m)82.98 / 25.29
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)435,200 / 197,404
Engine Weight (lbs / kg)478,500 / 217,044
Tender Loaded Weight (lbs / kg)170,000 / 77,111
Total Engine and Tender Weight (lbs / kg)648,500 / 294,155
Tender Water Capacity (gals / ML)8500 / 32.20
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)15.50 / 14.10
Minimum weight of rail (calculated) (lb/yd / kg/m)91 / 45.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)55.50 / 1410
Boiler Pressure (psi / kPa)210 / 14.50
High Pressure Cylinders (dia x stroke) (in / mm)26" x 32" / 660x813
Low Pressure Cylinders (dia x stroke) (in / mm)40" x 32" / 1016x813
Tractive Effort (lbs / kg)97,818 / 44369.55
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.45
Heating Ability
Firebox Area (sq ft / m2)385 / 35.78
Grate Area (sq ft / m2)108 / 10.04
Evaporative Heating Surface (sq ft / m2)5747 / 534.11
Superheating Surface (sq ft / m2)1436 / 133.46
Combined Heating Surface (sq ft / m2)7183 / 667.57
Evaporative Heating Surface/Cylinder Volume292.26
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation22,680
Same as above plus superheater percentage27,216
Same as above but substitute firebox area for grate area97,020
Power L18596
Power MT348.36