The United States Railroad Administration's Mountain design proved an excellent fit for the New Haven's fast freight requirements, so in addition to the 10 supplied during the USRA's administration, the railroad bought 39 more - 30 in 1920, 9 in 1924. Over time, the class (R-1, R-1-a, R-1-b) was updated with 95 sq ft of syphons and feedwater heaters. Maximum water evaporation rate was calculated at 56,555 lb/hour of which 22,825 lb/hour (40.4%) came from direct heating surfaces. As calculated by the New Haven, maximum steam consumption of 54,580 lb/hour yielded a 104% boiler factor.
To stave off the need to replace the class, the New Haven replaced the class's Southern valve gear with Baker gear in 1940 and fitted them with mechanical lubricators.
Thus equipped, all served the New Haven throughout World War II. Retirements occurred from the end of the war to the end of steam (1946-1951).
The R-2s ran until 1949-1951.
|Specifications by Steve Llanso|
|Railroad||New Haven (NYNH&H)||New Haven (NYNH&H)||New Haven (NYNH&H)|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.46||0.45||0.47|
|Overall Wheelbase (engine & tender)||75.62'||83.92'||85.33'|
|Axle Loading (Maximum Weight per Axle)||58200 lbs||65300 lbs|
|Weight on Drivers||230500 lbs||246000 lbs||261000 lbs|
|Engine Weight||334000 lbs||362500 lbs||379000 lbs|
|Tender Light Weight||184800 lbs||288500 lbs|
|Total Engine and Tender Weight||518800 lbs||667500 lbs|
|Tender Water Capacity||16000 gals||16000 gals||16000 gals|
|Tender Fuel Capacity (oil/coal)||10 tons||18 tons||18 tons|
|Minimum weight of rail (calculated) on which locomotive could run||96 lb/yard||103 lb/yard||109 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||200 psi||265 psi||265 psi|
|Cylinders (dia x stroke)||27" x 30"||27" x 30"||22" x 30" (3)|
|Tractive Effort||53883 lbs||71394 lbs||71101 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.28||3.45||3.67|
|Firebox Area||415 sq. ft||458 sq. ft||451 sq. ft|
|Grate Area||70.30 sq. ft||70.80 sq. ft||70.80 sq. ft|
|Evaporative Heating Surface||4188 sq. ft||4135 sq. ft||4085 sq. ft|
|Superheating Surface||1009 sq. ft||1758 sq. ft||1745 sq. ft|
|Combined Heating Surface||5197 sq. ft||5893 sq. ft||5830 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||210.66||207.99||206.33|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||14060||18762||18762|
|Same as above plus superheater percentage||16731||24391||24391|
|Same as above but substitute firebox area for grate area||98770||157781||155370|