PRR N2sa
| PRR N2sa | |
| Power type | Steam |
|---|---|
| Builder | ALCO, Baldwin |
| Build date | 1919 (rebuilt from 1923) |
| Total production | 130 |
| Configuration | 2-10-2 |
| UIC classification | 1'E2' |
| Gauge | 4 ft 8½ in (1435 mm) |
| Leading wheel size | 33 in (838 mm) |
| Trailing wheel size | 43 in (1,092 mm) |
| Wheelbase | 42 ft 2 in (12.85 m) |
| Length | 55 ft 4 in (16.87 m) without tender |
| Width | 10 ft 8 in (3.25 m) |
| Height | 15 ft 9 in (4.80 m) |
| Weight on drivers | 297,000 lb (135,000 kg) |
| Total weight | 380,700 lb (172,700 kg) |
| Locomotive and tender combined weight | 458,100 lb (207,800 kg) |
| Fuel type | Soft coal |
| Tender capacity | 17 tons coal, 12,000 US gallons water |
| Boiler pressure | 190 lb/ft² (1.31 MPa) |
| Fire grate area | 82.2 ft² (7.64 m²) |
| Heating surface: Tubes & flues | 4,560 ft² (423.6 m²) |
| Heating surface: Firebox | 420 ft² (39.0 m²) |
| Heating surface: Total | 4,980 ft² (462.7 m²) |
| Superheater area | 1,222 ft² (113.5 m²) |
| Cylinders | 2 |
| Cylinder size | 30×32 in (762×813 mm) |
| Valve gear | Walschaert valve gear, Southern valve gear |
| Top speed | 35 mph (56 km/h) |
| Tractive effort | 74,000 lbf (329 kN) |
| Factor of adhesion | 4.01 |
The Pennsylvania Railroad's class N2sa comprised rebuilds to PRR practise of the 130 USRA Heavy Santa Fe steam locomotives the railroad received under the auspices of the United States Railroad Administration, the nationalized central control of the nation's railroads during World War I. These locomotives, as received, were classified N2s. Rebuilds began from 1923 and all locomotives were rebuilt, classified N2sa after the rebuild. They received a Belpaire firebox, the PRR-standard smokebox front, a raised headlight following PRR practise, and the bell moved from smokebox front to boiler top. Brakemen's "doghouse" shacks were built on the rear tender decks.
Their assignments were primarily in PRR Lines West (of Pittsburgh), especially after the introduction of the I1s decapods. Both these and the PRR-designed N1s 2-10-2s were primarily used to haul iron ore from the ports on the Great Lakes and coal towards them, at a slow drag freight maximum speed of 35 mph. The arrival of larger power such as the J1 shifted the N2sa locomotives to more secondary roles.
References
- Railroad Master Mechanics' Association (1922). Locomotive Cyclopedia of American Practise - 6th Edition, 1922. Simmons-Boardman.
- Barris, Wes (2005-05-21). USRA Locomotives. SteamLocomotive.com. Retrieved on 2006-01-17.
- Staufer, Alvin (1962). Pennsy Power. Staufer, 82–87. LOC 62-20878.
