Raritan River 4-6-2 "Pacific" Locomotives in 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.

Principal Dimensions 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 / m)11.67 / 3.56
Engine Wheelbase (ft / m)30.25 / 9.22
Ratio of driving wheelbase to overall engine wheebase 0.39
Overall Wheelbase (engine & tender) (ft / m)61.68 / 18.80
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)112,000 / 50,802
Engine Weight (lbs / kg)172,000 / 78,018
Tender Loaded Weight (lbs / kg)130,000 / 58,967
Total Engine and Tender Weight (lbs / kg)302,000 / 136,985
Tender Water Capacity (gals / ML)7000 / 26.52
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)12 / 10.90
Minimum weight of rail (calculated) (lb/yd / kg/m)62 / 31
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)61 / 1549
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)20" x 26" / 508x660
Tractive Effort (lbs / kg)26,085 / 11831.97
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.29
Heating Ability
Firebox Area (sq ft / m2)165.80 / 13.66
Grate Area (sq ft / m2)44.80 / 4.16
Evaporative Heating Surface (sq ft / m2)2829 / 262.92
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2829 / 262.92
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

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