New Haven 4-4-2 "Atlantic" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class F-1 / H-1 (Locobase 8115)

Data from NH 1962 Steam Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Delivered as saturated-boiler locomotives in 1907, these Atlantics soon underwent an overhaul in 1912-1922 that added a superheater to the essential 4-4-2. Comparing the F-1 to the A-3 illustrates the signficant gains made by adopting that trailing axle. The grate area almost doubled and heating surface area jumped, which allowed fast running for longer stretches or with heavier trains.

Yet on the New Haven, as on almost all Atlantic operators, the appeal of a still larger boiler and more adhesion led to the class's eclipse in favor of the 4-6-2. New Haven's calculation of boiler underscored the difference. Total evaporation capability came to 35,495 lb/hour of which 11,715 lb/hour was generated by the direct heating surfaces; the latter included 28 sq ft in 4 arch tubes.. Maximum steam consumption reached 34,420 lb/hour, which yielded a boiler factor of 102%.

The F-1 was redesignated H-1 in 1928 to avoid confusion with an inherited CNE 2-8-0 class (Locobase objects: why didn't the foreign-road locomotives recede?) Drury (1993) notes that a couple were kept on the ready after 1935 to substitute for the diesel-powered Comet that ran between Boston and Providence. The last of the class was retired in 1947.

Specifications by Steve Llanso of Sweat House Media
ClassF-1 / H-1
Locobase ID8115
RailroadNew Haven (NYNH&H)
Number in Class12
Road Numbers1100-1111
Number Built12
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase 7.25'
Engine Wheelbase28.17'
Ratio of driving wheelbase to overall engine wheebase 0.26
Overall Wheelbase (engine & tender)56.08'
Axle Loading (Maximum Weight per Axle)53570 lbs
Weight on Drivers106720 lbs
Engine Weight206200 lbs
Tender Light Weight130000 lbs
Total Engine and Tender Weight336200 lbs
Tender Water Capacity6000 gals
Tender Fuel Capacity (oil/coal)14 tons
Minimum weight of rail (calculated)89 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter79"
Boiler Pressure190 psi
Cylinders (dia x stroke)22" x 26"
Tractive Effort25726 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.15
Heating Ability
Firebox Area213 sq. ft
Grate Area53.50 sq. ft
Evaporative Heating Surface2686 sq. ft
Superheating Surface538 sq. ft
Combined Heating Surface3224 sq. ft
Evaporative Heating Surface/Cylinder Volume234.81
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation10165
Same as above plus superheater percentage11893
Same as above but substitute firebox area for grate area47350
Power L118792
Power MT776.41

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