Data from American Locomotive Company Builder's Card "Class 3-cylinder 080 S 245", Order No. S-1588; and NH 1962 Steam Locomotives supplied in August 2013 by Allen Stanley from his extensive Rail Data Exchange collection.
Alco explored three-cylinder power arrangements for several customers in the 1920s. Most orders featured variations on a 2-8-2 fast freight or 4-8-2 dual-purpose design, but this all-adhesion eight-coupled heavy switcher was one of a kind.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Y-4a |
| Locobase ID | 16696 |
| Railroad | New York, New Haven & Hartford (NYNH&H) |
| Country | USA |
| Whyte | 0-8-0 |
| Number in Class | 16 |
| Road Numbers | 3600-3615 |
| Gauge | Std |
| Number Built | 16 |
| Builder | Alco-Schenectady |
| Year | 1924 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 16 / 4.88 |
| Engine Wheelbase (ft / m) | 16 / 4.88 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | 64.08 / 19.53 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 63,900 |
| Weight on Drivers (lbs / kg) | 245,000 / 111,130 |
| Engine Weight (lbs / kg) | 245,000 / 111,130 |
| Tender Loaded Weight (lbs / kg) | 286,500 / 129,954 |
| Total Engine and Tender Weight (lbs / kg) | 531,500 / 241,084 |
| Tender Water Capacity (gals / ML) | 16,000 / 60.61 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 13 / 16.40 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 102 / 51 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 57 / 1448 |
| Boiler Pressure (psi / kPa) | 200 / 1360 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 22" x 28" / 559x711 (3) |
| Tractive Effort (lbs / kg) | 60,627 / 27499.98 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.04 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 229 - 2" / 51 |
| Flues (number - dia) (in / mm) | 38 - 5.5" / 140 |
| Flue/Tube length (ft / m) | 16 / 4.88 |
| Firebox Area (sq ft / m2) | 253 / 23.50 |
| Grate Area (sq ft / m2) | 56.10 / 5.21 |
| Evaporative Heating Surface (sq ft / m2) | 3032 / 281.68 |
| Superheating Surface (sq ft / m2) | 740 / 68.75 |
| Combined Heating Surface (sq ft / m2) | 3772 / 350.43 |
| Evaporative Heating Surface/Cylinder Volume | 164.07 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 11,220 |
| Same as above plus superheater percentage | 13,464 |
| Same as above but substitute firebox area for grate area | 60,720 |
| Power L1 | 11,265 |
| Power MT | 405.47 |