Raritan River 4-6-2 "Pacific" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 15 (Locobase 12847)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 53, p. 402. Works number was 44064 in September 1916.

This was a freight Pacific, a type rarely encountered. It wasn't overendowed with firebox heating surface area, even when one includes the 18.8 sq ft (1.75 sq m) in three arch tubes.

It served the RRRR for over 30 years until it wrecked in October 1948 near the Pennsylvania Railroad interchange.

Specifications by Steve Llanso of Sweat House Media
Locobase ID12,847
RailroadRaritan River
Number in Class1
Road Numbers15
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft)11.67
Engine Wheelbase (ft)30.25
Ratio of driving wheelbase to overall engine wheebase 0.39
Overall Wheelbase (engine & tender) (ft)61.68
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)112,000
Engine Weight (lbs)172,000
Tender Loaded Weight (lbs)130,000
Total Engine and Tender Weight (lbs)302,000
Tender Water Capacity (gals)7000
Tender Fuel Capacity (oil/coal) (gals/tons)12
Minimum weight of rail (calculated) (lb/yd)62
Geometry Relating to Tractive Effort
Driver Diameter (in)61
Boiler Pressure (psi)180
High Pressure Cylinders (dia x stroke) (in)20" x 26"
Tractive Effort (lbs)26,085
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.29
Heating Ability
Firebox Area (sq ft)165.80
Grate Area (sq ft)44.80
Evaporative Heating Surface (sq ft)2829
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)2829
Evaporative Heating Surface/Cylinder Volume299.24
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation8064
Same as above plus superheater percentage8064
Same as above but substitute firebox area for grate area29,844
Power L17081
Power MT418.15

If you have any railroad data such as diagram books, rail station plans or anything else that you would be willing to share, please contact us.