| PRR N2sa | |
|---|---|
| Power type | Steam |
| Builder | ALCO, Baldwin |
| Build date | 1919 (rebuilt from 1923) |
| Total produced | 130 |
| Configuration | 2-10-2 |
| UIC classification | 1'E2' |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Leading wheel diameter |
33 in (0.84 m) |
| Driver diameter | 63 in (1.60 m) |
| Trailing wheel diameter |
43 in (1.09 m) |
| 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) |
| Locomotive weight | 380,700 lb (172,700 kg) |
| Locomotive & tender combined weight |
458,100 lb (207,800 kg) |
| Fuel type | Soft coal |
| Fuel capacity | 17 short tons (15 t) |
| Water capacity | 12,000 US gal (45,000 l; 10,000 imp gal) |
| Boiler pressure | 190 psi (1.3 MPa) |
| Firegrate area | 82.2 sq ft (7.64 m2) |
| Heating surface: Tubes and flues |
4,560 sq ft (424 m2) |
| Heating surface: Firebox |
420 sq ft (39 m2) |
| Heating surface: Total |
4,980 sq ft (463 m2) |
| Superheater area | 1,222 sq ft (113.5 m2) |
| Cylinders | 2 |
| Cylinder size | 30 × 32 in (760 × 810 mm) |
| Valve gear | Walschaerts, Southern |
| Top speed | 35 mph (56 km/h) |
| Tractive effort | 74,000 lbf (329.17 kN) |
| Factor of adhesion |
4.01 |
The Pennsylvania Railroad's class N2sa comprised rebuilds to PRR practice 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 practice, 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 miles per hour (56 km/h). The arrival of larger power such as the J1 shifted the N2sa locomotives to more secondary roles.
| A (0-4-0): | A1 · A2 · A3 · A4 · A5s | B (0-6-0): | B1 (s) · B2 · B3 · B4 · B5 · B6 · B7 · B8 · B1 (e) | C (0-8-0): | C1 · C29 · C30 · C31 |
|---|---|---|---|---|---|
| D (4-4-0): | D1 · D2 · D3 · D4 · D5 · D6 · D7 · D8 · D9 · D10 · D11 · D12 · D13 · D14 · D15 · D16 · D21 · D22 · D23 · D24 · D25 · D26 · D30 · D31 · D32 · D33 · D34 · D35 · D36 · D37 · D38 · D39 · D61 · "Odd D" #10003 | ||||
| E (4-4-2): | E1 · E2 · E3 · E4 · E5 · E6 · E7 · E21 · E22 · E23 · E28 | ||||
| F (2-6-0): | F1 · F2 · F3 · F21 · F22 · F23 · F24 · F25 · F26 · F27 · F30 · F31 · F61 | ||||
| G (4-6-0): | G1 · G2 · G3 · G4 · G5 · G53 | H (2-8-0): | H1 · H2 · H3 · H4 · H5 · H6 · H8 · H9 · H10 | I (2-10-0): | I1s |
| J (2-6-2 and 2-10-4): | J1 · J28 | K (4-6-2): | K1 · K2 · K3s · K4s · K5 | L (2-8-2): | L1s · L2s · L5 · L6 |
| M (4-8-2): | M1 | N (2-10-2): | N1s · N2s | O (4-4-4): | O1 |
| P (4-6-4): | P5 | Q (4-6-4-4 and 4-4-6-4): | Q1 · Q2 | R (4-8-4): | R1 |
| S (6-4-4-6 and 6-8-6): | S1 · S2 | T (4-4-4-4): | T1 | ||
| Articulated steam locomotives: | CC1s · CC2s · HC1s · HH1s · HH2s | Articulated electric locomotives: | AA1 · BB1 · BB2 · BB3 · DD1 · DD2 · FF1 · FF2 · GG1 | Non-standard: | E2b · E2c · E3b · E44 |