Central RR of New Jersey 4-6-2 "Pacific" Type Locomotives

Class G-1 (Locobase 6722)

Data from CNJ 7 - 1944 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

These were the first Pacifics for the CNJ and they set the tone for all that followed. Note the large grate area, which shows 9-ft-wide Wootten firebox. The 1944 book shows several variations of firebox heating surface. In addition to the 198.2 sq ft of the firebox and the 66.9 sq ft afforded by the combustion chamber, other areas included:

Locomotive Syphons area Arch tubes area

820-821 3 91 3 23.3

(this is the variant in the specfications).

823 2 73.5 3 23.3

822, 824, 825 6 46

The 822's configuration matched that of the G-2s.

The engines stayed in service until the end of steam, their retirements coming in 1948-1954.

Class G-2 (Locobase 3307)

Data from CNJ 7 - 1944 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection. This entry matches up with one of the locomotives to which James Partington, Estimating Engineer for Alco, compared his company's #50000 in a 5 November 1921 Railway Age article. In that article, Partington did not identify the class or even the railroad from which the table entries came, so Locobase set itself the task of uncovering their identities.

The first 11 Pacifics built for the CNJ were identical except that the last 6 -- the G-2 class -- had Delta trailing trucks. Unlike the G-1, which had several firebox configurations, the 1944 book shows only one for the G-2. Total firebox heating surface included 66.9 sq ft of combustion chamber and 46 sq ft in 6 arch tubes.

Class G-3 (Locobase 138)

Data from tables in 1930 Locomotive Cyclopedia. Works #60296-60300.

Narrow (for soft coal) firebox had combustion chamber with heating surface of 64 sq ft, 113 sq ft of thermic syphons and arch tubes, boiler fitted with feedwater heater. Operated in New Jersey.

Three were painted blue to match the railroad's Blue Comet varnish in 1929. Later reclassified P47. Retired in 1950-1955.

Class G-4s (Locobase 139)

Firebox heating surface included 64 sq ft in the combustion chamber and 109 sq ft of thermic syphons and arch tubes. Five big superheated Pacifics that ran on CNJ's Pennsylvania lines. Fitted with Elesco feedwater heaters. Railway Age 21 February 1931 explains that the loading gauge for these engines was limited by size of the Lansford Tunnel. Also , heavy grades and heavy suburban trains meant that driver diameter could be no larger than 74".

Later reclassified P52 and retired in 1954-1955.

Specifications
Class	G-1	G-2	G-3	G-4s
Locobase ID	6722	3307	138	139
Railroad	Central RR of New Jersey	Central RR of New Jersey	Central RR of New Jersey	Central RR of New Jersey
Whyte	4-6-2	4-6-2	4-6-2	4-6-2
Road Numbers	820-825	826-830	831-835	810-814
Gauge	Std	Std	Std	Std
Builder	Baldwin	Baldwin	Baldwin	Baldwin
Year	1918	1923	1927	1930
Valve Gear	Walschaert	Walschaert	Walschaert	Walschaert
	Locomotive Length and Weight
Driver Wheelbase	13.83'	13.83'	13.83'	13.83'
Engine Wheelbase	35.67'	36.50'	36.67'	36.75'
Ratio of driving wheelbase to overall engine wheebase	0.39	0.38	0.38	0.38
Overall Wheelbase (engine & tender)	72.01'	72.01'	72.17'	78.20'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers	180390 lbs	196000 lbs	197660 lbs	205900 lbs
Engine Weight	306330 lbs	306000 lbs	326470 lbs	333830 lbs
Tender Light Weight	169000 lbs	169000 lbs	217000 lbs	253900 lbs
Total Engine and Tender Weight	475330 lbs	475000 lbs	543470 lbs	587730 lbs
Tender Water Capacity	8000 gals	8000 gals	10000 gals
Tender Fuel Capacity (oil/coal)	15 tons	12 tons	15 tons	tons
Minimum weight per yard of rail on which locomotive could run	100.22 lb rail	108.89 lb rail	109.81 lb rail	114.39 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	79"	79"	79"	74"
Boiler Pressure	210 psi	210 psi	230 psi	240 psi
Cylinders (dia x stroke)	26" x 28"	26" x 28"	26" x 28"	26" x 28"
Tractive Effort	42768 lbs	42768 lbs	46841 lbs	52180 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	4.22	4.58	4.22	3.95
	Heating Ability
Firebox Area	379.40 sq. ft	311.10 sq. ft	405 sq. ft	401 sq. ft
Grate Area	94.81 sq. ft	94.81 sq. ft	84.30 sq. ft	84.30 sq. ft
Evaporative Heating Surface	3828	3760	3849	3591
Superheating Surface	791	791	791	1000
Combined Heating Surface	4619	4551	4640	4591
Evaporative Heating Surface/Cylinder Volume	222.48	218.53	223.70	208.71
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	19910.10	19910.10	19389	20232
Same as above plus superheater percentage	23319.69	23370.63	22694.32	24638.88
Same as above but substitute firebox area for grate area	93318.11	76686.05	109029.67	117202.75
Power L1	20640.23	19982.17	22868.21	25109.88
Power MT	756.76	674.28	765.19	806.57