Central RR of New Jersey 2-6-2 "Prairie" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class J-1/SU23 (Locobase 5312)

Data from American Engineer and Railroad Journal (June 1902), supplemented by CNJ 7 - 1944 Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

In 1919, this class was designated J1. As delivered, the 20 purchased by the CNJ in 1902 are shown in Locobase 12655. Later the boiler was superheated to the dimensions shown in the specs. The class had 10 1/2" (268 mm) piston valves.

The 1945 reclassification, which combined letter codes with the tractive effort in thousands, gave the survivors SU23

Class J1 (Locobase 12655)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 25. p. 210. See also E E R Tratman, "Tank Locomotives", Official Proceedings of the Western Railway Club (Chicago: W F Hall Printing Company, 1905), pp. 349-350. for details on their operation. Works numbers were 20245 in April 1902; 20839-20840, 20867, 20882-20883 in August; 20906-20908, 20940-20942 in September; 22397, 22401, 22412 in June 1903; 22432, 22444, 22492, 22499, 22518 in July.

Commuter side-tank engine remarkably similar to that described on Locobase 472. Firebox heating surface included 43 sq ft (4 sq m) of arch tubes. These engines hauled suburban trains from Jersey City south to Perth Amboy (21.1 miles/34 km/h) or west to Somerville, NJ (34.7 miles/55.9 km/h). The trains were made up of 2-10 cars each weighing between 55,000 and 62,000 lb (24,948-28,123 kg). The Perth Amboy could take anywhere from 32-52 minutes, the shorter time representing a two-car train making two stops and averaging 39.6 mph (63.75 km/h) and the longer time a 20-stop train averaging 24.3 mph (39.1 km/h).

The class was superheated in the 1920s; see Locobase 5312. Five engines sold to the Long Island Railroad had very similar dimensions - see Locobase 9078

Specifications by Steve Llanso of Sweat House Media
Locobase ID5312 12655
RailroadCentral RR of New JerseyCentral RR of New Jersey
Number in Class2025
Road Numbers200-224200-224
Number Built25
BuilderCNJBurnham, Williams & Co
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase14'14'
Engine Wheelbase31.67'31.67'
Ratio of driving wheelbase to overall engine wheebase 0.44 0.44
Overall Wheelbase (engine & tender)31.67'31.67'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers137500 lbs129200 lbs
Engine Weight208400 lbs189900 lbs
Tender Light Weight
Total Engine and Tender Weight208400 lbs189900 lbs
Tender Water Capacity3000 gals3000 gals
Tender Fuel Capacity (oil/coal)6 tons tons
Minimum weight of rail (calculated)76 lb/yard72 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter63"63"
Boiler Pressure200 psi200 psi
Cylinders (dia x stroke)18" x 26"18" x 26"
Tractive Effort22731 lbs22731 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 6.05 5.68
Heating Ability
Firebox Area123.80 sq. ft137.40 sq. ft
Grate Area54.50 sq. ft54.50 sq. ft
Evaporative Heating Surface1357 sq. ft1821 sq. ft
Superheating Surface266 sq. ft
Combined Heating Surface1623 sq. ft1821 sq. ft
Evaporative Heating Surface/Cylinder Volume177.21237.80
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1090010900
Same as above plus superheater percentage1264410900
Same as above but substitute firebox area for grate area2872227480
Power L1119846878
Power MT576.44352.09

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