PRR O1

Infobox Locomotive Auto
name = PRR O1
caption = PRR official photo of #7850
powertype = electric

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service = passenger
builder = Pennsylvania Railroad Altoona Works
builderother = Electrical equipment by General Electric, Westinghouse or Brown Boveri
builddate = 1930–1931
totalproduction = 8
whytetype = 4-4-4
aarwheels = 2-C-2
uicclass = 2'C2'
leadingsize = convert|36|in|mm|abbr=on
driversize = convert|72|in|mm|abbr=on
trailingsize = convert|36|in|mm|abbr=on
wheelbase = convert|40|ft|abbr=on (overall)
convert|10|ft|abbr=on (fixed)
length = convert|52|ft|8|in|abbr=oncite web
author = Pennsylvania Railroad
title = PRR Equipment Diagrams: Tracing #E-93844: O1a
url = http://prr.railfan.net/diagrams/PRRdiagrams.html?diag=o1a.gif&sel=ele&sz=sm&fr=
work = PRR.Railfan.net
date = 1932-08-18
quote =
accessdate = 2008-05-02 ]
width = convert|10|ft|6|in|abbr=oncite web
author = Pennsylvania Railroad
title = PRR Equipment Diagrams: O1, O1b, O1c
url = http://prr.railfan.net/diagrams/PRRdiagrams.html?diag=o1_o1b_o1c.gif&sel=ele&sz=sm&fr=
work = PRR.Railfan.net
date = 1933-09-27
quote =
accessdate = 2008-05-02 ]
height = convert|15|ft|abbr=on (over locked-down pantographs)
axleload = O1,O1b,O1c: convert|75000|lb|abbr=on
O1a: convert|78000|lb|abbr=on
weightondrivers = O1,O1b,O1c: convert|150000|lb|abbr=on
O1a: convert|156000|lb|abbr=on
weight = O1,O1b,O1c: convert|300000|lb|abbr=on
O1a: convert|309400|lb|abbr=on
electricsystem = 11 kV 25 Hz AC
collectionmethod = pant
tractionmotors = 4 (2 per axle), power output each - O1: convert|500|hp|abbr=on; O1a,O1c: convert|625|hp|abbr=on; O1b: convert|550|hp|abbr=on
transmission = Geared quill drive
topspeed = convert|90|mph|abbr=on
poweroutput = O1: convert|2000|hp|abbr=on; O1a,O1c: convert|2500|hp|abbr=on; O1b: convert|2200|hp|abbr=on
tractiveeffort = O1: convert|28500|lbf|kN|abbr=on;
O1a,O1c: convert|37500|lbf|kN|abbr=on;
O1b: convert|35000|lbf|kN|abbr=on
factorofadhesion = O1: 5.26; O1a: 4.16; O1b: 4.29; O1c: 4.00
safety = Cab signalling

The Pennsylvania Railroad's class O1 comprised eight experimental boxcab electric locomotivescite book
last = Staufer
first = Alvin F.
title = Pennsy Power: Steam and Electric Locomotives of the Pennsylvania Railroad, 1900–1957
year = 1962
publisher = Alvin F. Staufer] built in 1930 and 1931.cite web
last = Barris
first = Wes
title = The O-1
url = http://www.steamlocomotive.com/GG1/O-1.shtml
year = 2007
accessdate = 2008-05-01] They had the wheel arrangement classified as 4-4-4 in the Whyte notation (UIC: 2'B2'; AAR: 2-B-2). Although successful, they were not powerful enough for the railroad's increasingly heavy trains. For production, the PRR chose to concentrate on the P5 class, effectively an enlarged and more powerful version of the O1 with an additional pair of driving wheels.

The eight locomotives were divided into four sub-classes — O1, O1a, O1b, and O1c.cite book
last = Schafer
first = Mike
coauthors = Brian Solomon
title = Pennsylvania Railroad
year = 1997
publisher = MBI
pages = p. 10] Each sub-class was fitted with a different combination of traction motor power output and drive gear ratio. In addition, three O1 locomotives were fitted with General Electric equipment, three with Westinghouse, and two with Brown Boveri. The O1b locomotives used a Buchli drive system to link the traction motors to the driving wheels.

They were generally employed in pairs by sub-class, generally on short-distance passenger trains between Newark, New Jersey and New York City's Pennsylvania Station. During World War II they were used on the "Susquehannock" between Harrisburg, Pennsylvania and New York City. Later in life, they were used for transfer work around Penn Station and Sunnyside Yard, mostly hauling empty passenger stock. They were all out of service and scrapped by the mid 1960s.

References

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