PRR N2sa

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PRR N2sa
PRR N2sa.jpg
Specifications
Power typeSteam
BuilderALCO,
Baldwin
Build date1919 (rebuilt from 1923)
Total produced130
Configuration2-10-2
UIC classification1'E2'
Gauge4 ft 8 12 in (1,435 mm)
Leading wheel
diameter
33 in (0.84 m)
Driver diameter63 in (1.60 m)
Trailing wheel
diameter
43 in (1.09 m)
Wheelbase42 ft 2 in (12.85 m)
Length55 ft 4 in (16.87 m) without tender
Width10 ft 8 in (3.25 m)
Height15 ft 9 in (4.80 m)
Weight on drivers297,000 lb (135,000 kg)
Locomotive weight380,700 lb (172,700 kg)
Locomotive and tender
combined weight
458,100 lb (207,800 kg)
Fuel typeSoft coal
Fuel capacity17 short tons (15 t)
Water capacity12,000 US gal (45,000 l; 10,000 imp gal)
Boiler pressure190 psi (1.3 MPa)
Firegrate area82.2 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 area1,222 sq ft (113.5 m2)
Cylinders2
Cylinder size30 in × 32 in (760 mm × 810 mm)
Valve gearWalschaerts, Southern
Top speed35 mph (56 km/h)
Tractive effort74,000 lbf (329.17 kN)
Factor of
adhesion
4.01
Career
 
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PRR N2sa
PRR N2sa.jpg
Specifications
Power typeSteam
BuilderALCO,
Baldwin
Build date1919 (rebuilt from 1923)
Total produced130
Configuration2-10-2
UIC classification1'E2'
Gauge4 ft 8 12 in (1,435 mm)
Leading wheel
diameter
33 in (0.84 m)
Driver diameter63 in (1.60 m)
Trailing wheel
diameter
43 in (1.09 m)
Wheelbase42 ft 2 in (12.85 m)
Length55 ft 4 in (16.87 m) without tender
Width10 ft 8 in (3.25 m)
Height15 ft 9 in (4.80 m)
Weight on drivers297,000 lb (135,000 kg)
Locomotive weight380,700 lb (172,700 kg)
Locomotive and tender
combined weight
458,100 lb (207,800 kg)
Fuel typeSoft coal
Fuel capacity17 short tons (15 t)
Water capacity12,000 US gal (45,000 l; 10,000 imp gal)
Boiler pressure190 psi (1.3 MPa)
Firegrate area82.2 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 area1,222 sq ft (113.5 m2)
Cylinders2
Cylinder size30 in × 32 in (760 mm × 810 mm)
Valve gearWalschaerts, Southern
Top speed35 mph (56 km/h)
Tractive effort74,000 lbf (329.17 kN)
Factor of
adhesion
4.01
Career

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.

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