PRR N2sa

Infobox Locomotive
name = PRR N2sa
powertype = Steam

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whytetype = 2-10-2
uicclass = 1'E2'
builder = ALCO, Baldwin
totalproduction = 130
builddate = 1919 (rebuilt from 1923)
height = 15 ft 9 in (4.80 m)
length = 55 ft 4 in (16.87 m) without tender
width = 10 ft 8 in (3.25 m)
wheelbase = 42 ft 2 in (12.85 m)
leadingsize = 33 in (838 mm)
drivingsize = 63 in (1,600 mm)
trailingsize = 43 in (1,092 mm)
fueltype = Soft coal
gauge = RailGauge|ussg
cylindercount = 2
cylindersize = 30×32 in (762×813 mm)
valvegear = Walschaerts
firearea = 82.2 ft² (7.64 m²)
tubesandflues = 4,560 ft² (423.6 m²)
fireboxarea = 420 ft² (39.0 m²)
totalsurface = 4,980 ft² (462.7 m²)
superheaterarea = 1,222 ft² (113.5 m²)
tractiveeffort = 74,000 lbf (329 kN)
weightondrivers = 297,000 lb (135,000 kg)
weight = 380,700 lb (172,700 kg)
locotenderweight = 458,100 lb (207,800 kg)
valvegear = Walschaerts, Southern
boilerpressure = 190 lb/ft² (1.31 MPa)
factorofadhesion = 4.01
topspeed = 35 mph (56 km/h)
tenderc

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 convert|35|mph. The arrival of larger power such as the J1 shifted the N2sa locomotives to more secondary roles.

References

*
* cite web
url = http://www.steamlocomotive.com/misc/usra.shtml
title = USRA Locomotives
accessdate = 2006-01-17
work = SteamLocomotive.com
year = 2005-05-21
author = Barris, Wes
* cite book
author = Staufer, Alvin
title = Pennsy Power
id = LOC 62-20878
year = 1962
publisher = Staufer
pages = 82–87