Central RR of New Jersey 2-6-2 "Prairie" Locomotives in 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 Rail Data Exchange.

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

Principal Dimensions by Steve Llanso of Sweat House Media
ClassJ-1/SU23J1
Locobase ID5312 12,655
RailroadCentral RR of New JerseyCentral RR of New Jersey
CountryUSAUSA
Whyte2-6-2T2-6-2T
Number in Class2025
Road Numbers200-224200-224
GaugeStdStd
Number Built25
BuilderCNJBurnham, Williams & Co
Year1902
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)14 / 4.2714 / 4.27
Engine Wheelbase (ft / m)31.67 / 9.6531.67 / 9.65
Ratio of driving wheelbase to overall engine wheebase 0.44 0.44
Overall Wheelbase (engine & tender) (ft / m)31.67 / 9.6531.67 / 9.65
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)137,500 / 62,369129,200 / 58,604
Engine Weight (lbs / kg)208,400 / 94,529189,900 / 86,137
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)208,400189,900
Tender Water Capacity (gals / ML)3000 / 11.363000 / 11.36
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)6 / 5.50
Minimum weight of rail (calculated) (lb/yd / kg/m)76 / 3872 / 36
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)63 / 160063 / 1600
Boiler Pressure (psi / kPa)200 / 13.80200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)18" x 26" / 457x66018" x 26" / 457x660
Tractive Effort (lbs / kg)22,731 / 10310.6222,731 / 10310.62
Factor of Adhesion (Weight on Drivers/Tractive Effort) 6.05 5.68
Heating Ability
Firebox Area (sq ft / m2)123.80 / 11.51137.40 / 12.77
Grate Area (sq ft / m2)54.50 / 5.0754.50 / 5.07
Evaporative Heating Surface (sq ft / m2)1357 / 126.121821 / 169.24
Superheating Surface (sq ft / m2)266 / 24.72
Combined Heating Surface (sq ft / m2)1623 / 150.841821 / 169.24
Evaporative Heating Surface/Cylinder Volume177.21237.80
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation10,90010,900
Same as above plus superheater percentage12,64410,900
Same as above but substitute firebox area for grate area28,72227,480
Power L111,9846878
Power MT576.44352.09