Central RR of New Jersey 4-6-2 "Pacific" Locomotives in the USA

The Central Railroad of New Jersey based their pacific design on the Reading's G1s, but with more weight, larger cylinders, and slightly smaller drivers. This resemblance to Reading engines was to decrease as time went on. All of CNJ's pacifics can point to the Reading G1s as an increasingly distant ancestor. The G3s and G4s were based on the G1s, but with additional equipment, such as stokers, mechanical lubricators, feedwater heaters, and a narrower firebox.

These first two classes were hand fired until the 1940s, when stokers were applied. Retirements began in 1948, and the last were retired in 1954.

Class G3s, had Elesco feedwater heaters, stokers, and mechanical lubricators. The firebox was smaller on these engines; 8 feet wide, versus 9 feet wide for the G1s and G2s classes. CNJ was burning more and more soft coal, and these engines reflected that fact. Engines 831-833 were painted in Blue Comet Colors from 1929 to the mid 1930s. Engine 834 was painted a dark green briefly for service on the Bullet. Engine 835 remained black her whole life. Class G3s had what were essentially copies of USRA 10,000 gallon tenders for coal and water; these tenders were a bit larger than the 9,000 gallon tenders that came with the earlier Pacifics. The G3s class was built in 1928, and the last were retired in 1955.

CNJ's last five Pacifics were the G4s class. These engines had smaller drivers for service in the hills and tunnels of eastern Pennsylvania. The G4s class had 13,000 gallon welded tenders. These engines were otherwise similar to the G3s class. The last G4s was retired in 1955.

CNJ changed their locomotive class system several times during the life of these engines. The first change was in 1944, when the small letter s (for superheating) was dropped from locomotive classifications. In 1945, CNJ came up with a new class system. P was for Pacifics, and the two digits were for the tractive effort in thousands of pounds. The G1s and G2s class became P43. The G3s class became class P47, and the G4s class became P52.


Class Details by Steve Llanso of Sweat House Media

Class G-1 (Locobase 6722)

Data from CNJ 7 - 1944 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also DeGolyer, Vol 59, pp. 113+. Works numbers were 48992 in June 1918; 49235, 49306, 49362-49363, 49392 in July.

These were the first Pacifics for the CNJ and they set the tone for all that followed. Note the large grate area, which shows the 9-ft-wide Wootten firebox which lay just ahead of the conventional cab. Piston valves measured 13" (330 mm) in diameter. The 1944 book shows several variations of firebox heating surface. In addition to the 198.2 sq ft (18.4 sq m) of the firebox and the 66.9 sq ft (6.2 sq m) afforded by the combustion chamber, other areas included:

Locomotive Syphons area Arch tubes area

820-821 3 91/8.45 3 23.3/2.15 sq m

(this is the variant in the specfications).

823 2 73.5/6.8 3 23.3/2.15 sq m

822, 824, 825 6 46

The 822's configuration matched that of the G-2s (Locobase 3307).

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 Rail Data Exchange. See also DeGolyer, Vol 69, pp. 1+. Works numbers were 56311-56315 in March 1923.

This entry matches up with one of the locomotives to which James Partington, Estimating Engineer for Alco, compared his company's #50000 in "Avoidable Waste in Locomotive Operation as Affected by Design", Railway Age, Volume 95, No. 11 (5 November 1921), pp. 673-677. 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 eleven Pacifics built for the CNJ were identical except that the last six -- 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 (6.2 sq m) of combustion chamber and 46 sq ft (4.3 sq m) in six arch tubes. Piston valves measured 13" (331 mm) in diameter. Reverse gear was Alco Type E.


Class G-3 (Locobase 138)

Data from tables in 1930 Locomotive Cyclopedia. See also DeGolyer, Vol 77, pp. 402+ and CNJ 7 - 1944 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. Works numbers were 60296-60300 in December 1927.

While not over-endowed with superheater area and fitted with relatively small 13" (331 mm) piston valves, these five Pacifics had boilers with lots of aids to heating water. The design's firebox had combustion chamber contributing 64 sq ft (5.95 sq m) to the direct heating surface area along with 90 sq ft (8.35 sq m) from two thermic syphons in the firebox and one in the combustion chamber, and 23 sq ft (2.15 sq m) from the arch tubes. The boiler received its water through an Elesco K-39 feed water heater.

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


Class G-4s (Locobase 139)

Data from Railway Age 21 February 1931l; see also DeGolyer, Vol 82, pp. 15+. Works numbers were 61507-61508 in September 1930, 61513-61515 in October.

Firebox heating surface included 64 sq ft (5.95 sq m) in the combustion chamber, 86 sq ft (8 sq m) of thermic syphons, and 23 sq ft (2.1 sq m) in arch tubes. Five big superheated Pacifics that ran on CNJ's Pennsylvania lines. Fitted with Elesco feedwater heaters. Railway Age 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 by Steve Llanso of Sweat House Media
ClassG-1G-2G-3G-4s
Locobase ID6722 3307 138 139
RailroadCentral RR of New JerseyCentral RR of New JerseyCentral RR of New JerseyCentral RR of New Jersey
CountryUSAUSAUSAUSA
Whyte4-6-24-6-24-6-24-6-2
Number in Class6555
Road Numbers820-825826-830831-835810-814
GaugeStdStdStdStd
Number Built6555
BuilderBaldwinBaldwinBaldwinBaldwin
Year1918192319271930
Valve GearWalschaertWalschaertWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.83 / 4.2213.83 / 4.2213.83 / 4.2213.83 / 4.22
Engine Wheelbase (ft / m)35.67 / 10.8736.50 / 11.1336.67 / 11.1836.75 / 11.20
Ratio of driving wheelbase to overall engine wheebase 0.39 0.38 0.38 0.38
Overall Wheelbase (engine & tender) (ft / m)72.01 / 21.9572.01 / 21.9572.17 / 2278.20 / 23.84
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)180,390 / 81,824196,000 / 88,904197,660 / 89,657205,900 / 93,395
Engine Weight (lbs / kg)306,330 / 138,949306,000 / 138,799326,470 / 148,084333,830 / 151,423
Tender Loaded Weight (lbs / kg)169,000 / 76,657169,000 / 76,657217,000 / 98,430253,900 / 115,167
Total Engine and Tender Weight (lbs / kg)475,330 / 215,606475,000 / 215,456543,470 / 246,514587,730 / 266,590
Tender Water Capacity (gals / ML)8000 / 30.308000 / 30.3010,000 / 37.8813,500 / 51.14
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)15 / 13.6012 / 10.9015 / 13.6015 / 13.60
Minimum weight of rail (calculated) (lb/yd / kg/m)100 / 50109 / 54.50110 / 55114 / 57
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)79 / 200779 / 200779 / 200774 / 1880
Boiler Pressure (psi / kPa)210 / 14.50210 / 14.50230.60 / 15.90239.30 / 16.50
High Pressure Cylinders (dia x stroke) (in / mm)26" x 28" / 660x71126" x 28" / 660x71126" x 28" / 660x71126" x 28" / 660x711
Tractive Effort (lbs / kg)42,768 / 19399.2642,768 / 19399.2646,963 / 21302.0852,028 / 23599.53
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.22 4.58 4.21 3.96
Heating Ability
Firebox Area (sq ft / m2)303 / 28.15311.10 / 28.91405 / 37.63401 / 37.25
Grate Area (sq ft / m2)94.81 / 8.8194.81 / 8.8184.30 / 7.8384.30 / 7.83
Evaporative Heating Surface (sq ft / m2)3757 / 349.033760 / 349.443849 / 357.583591 / 333.61
Superheating Surface (sq ft / m2)816 / 75.81791 / 73.51791 / 73.491000 / 92.90
Combined Heating Surface (sq ft / m2)4573 / 424.844551 / 422.954640 / 431.074591 / 426.51
Evaporative Heating Surface/Cylinder Volume218.35218.53223.70208.71
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation19,91019,91019,44020,173
Same as above plus superheater percentage23,49423,29522,74424,611
Same as above but substitute firebox area for grate area75,08376,437109,270117,070
Power L120,27419,98222,92825,037
Power MT743.33674.28767.19804.23

Photos