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.
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 other 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 | |
|---|---|
| Class | F-1 / H-1 |
| Locobase ID | 8115 |
| Railroad | New Haven |
| Whyte | 4-4-2 |
| Road Numbers | 1100-1111 |
| Gauge | Std |
| Builder | Alco-Schenectady |
| Year | 1912 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 7.25' |
| Engine Wheelbase | 28.17' |
| 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 Drivers | 106720 lbs |
| Engine Weight | 206200 lbs |
| Tender Light Weight | 130000 lbs |
| Total Engine and Tender Weight | 336200 lbs |
| Tender Water Capacity | 6000 gals |
| Tender Fuel Capacity (oil/coal) | 14 tons |
| Minimum weight per yard of rail on which locomotive could run | 89 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 79" |
| Boiler Pressure | 190 psi |
| Cylinders (dia x stroke) | 22" x 26" |
| Tractive Effort | 25726 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.15 |
| Heating Ability | |
| Firebox Area | 213 sq. ft |
| Grate Area | 53.50 sq. ft |
| Evaporative Heating Surface | 2686 |
| Superheating Surface | 538 |
| Combined Heating Surface | 3224 |
| Evaporative Heating Surface/Cylinder Volume | 234.81 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 10165 |
| Same as above plus superheater percentage | 12198 |
| Same as above but substitute firebox area for grate area | 48564 |
| Power L1 | 18792 |
| Power MT | 776.41 |
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