Encyclopedia: PRR...
Encyclopedia : P : PR : PRR (54 articles)
PRR
The initialism PRR may refer to The Pennsylvania Railroad (AAR reporting mark PRR)In cell biology, a pattern recognition receptorThe Personal Role Radio system carried by UK troops. ..
PRRS
PRRS can refer to: Porcine Reproductive and Respiratory Syndrome VirusRadical Socialist Republican PartyThis is a [disambiguationdisambiguation] page: a list of articles associated with the same title. If an referred you to this page, you may wish to change the link to point directly to ..
PRR AA1
The Pennsylvania Railroad's class AA1 comprised two experimental electric locomotives constructed in 1905 at the start of the PRR's electrification project. They were testbeds for larger locomotives to come. Both were of B-B wheel arrangement in the Association of American Railroads classification..
PRR B1
The Pennsylvania Railroad's class B1 comprised 42 switcher-type electric locomotives built between 1926 and 1935. They were of 0-6-0 wheel arrangement in the Whyte notation. As built, the first 28 locomotives formed permanently coupled pairs. References (simple drawing and specifications, for ge..
PRR B6
B6sb #4033 at Erie, Pennsylvania, 1937. The B6sb subtype was the most numerous and successful of the B6 locomotives. This is a B6sa, #3. Note the radial-stay firebox, round-topped and lacking the square Belpaire "shoulders". This is an original B6. Note the absence of external valv..
PRR DD1
The Pennsylvania Railroad's class DD1 were semi-permanently coupled pairs of third rail direct current electric locomotives built for the railroad's initial New York-area electrification. They operated between Manhattan Transfer and Pennsylvania Station in New York City, and from there to th..
PRR DD2
The Pennsylvania Railroad's class DD2 electric locomotive was a single prototype locomotive never placed into series production. It was intended as an improved and simplified GG1 for use on the planned, but never built, extension of the PRR's electrification west of Harrisburg, Pennsylvania. The..
PRR E2b
Pennsylvania Railroad class E2b comprised six experimental B-B electric locomotives built for the railroad by General Electric. They were commonly used in three pairs. Like most previous PRR electric locomotives, they were straight AC-powered, and did not use rectifiers. Because of this, they cou..
PRR E3b
Pennsylvania Railroad class E3b comprised a pair of experimental Bo-Bo-Bo (UIC) or B-B-B (AAR) electric locomotives. The bodywork and running gear was produced by Baldwin-Lima-Hamilton while the electrical equipment was provided by Westinghouse. ..
PRR E3c
Pennsylvania Railroad class E3c comprised a pair of experimental Co-Co (UIC) or C-C (AAR) electric locomotives. The bodywork and running gear was produced by Baldwin-Lima-Hamilton while the electrical equipment was provided by Westinghouse. ..
PRR E44
The Pennsylvania Railroad class E44 electric locomotives were rectifier-equipped units for freight use built for the railroad by General Electric from 1960. ..
PRR equipment colors and painting
The Pennsylvania Railroad was an early proponent of standardised colors and paint schemes for its locomotives, rolling stock and other equipment. Pennsylvania Railroad locomotives were uniformly painted in a color commonly called Brunswick Green but known to the railroad as Dark Green Locomotive En..
PRR FF1
The Pennsylvania Railroad's class FF1 of electric locomotive comprised a single prototype, numbered #3931 and nicknamed "Big Liz" by its crews. It was built in 1917 for the task of hauling freight trains across the Allegheny Mountains, which the PRR planned to electrify; this was never accom..
PRR FF2
The Pennsylvania Railroad's class FF2 electric locomotives comprised eight boxcab units purchased from the Great Northern Railway in 1956 following the GN's dismantling of its Cascade Tunnel electrification. Their GN classifications were Y1 and Y1a. One unit was dismantled for spares, and the rema..
PRR GG1
The Pennsylvania Railroad's GG1 class of electric locomotives were built between 1934 to 1943 at the PRR shops in Altoona, Pennsylvania, with a total of 139 units constructed. They remained in service with the PRR's successors until the early 1980s. The GG1 became one of the most recognized and f..
PRR H8
PRR H8b at Camden, New Jersey in 1957. The Pennsylvania Railroad's class H8, H9s and H10s steam locomotives were of the 2-8-0 "Consolidation" type, the last three classes of such built by the railroad. The three classes differed only in cylinder diameter and thus tractive effort, each subsequ..
PRR I1s
PRR I1s prepares to leave the docks at Cleveland, Ohio with a trainload of iron ore in May, 1943. PRR I1s #4300 in its Baldwin Locomotive Works builders' photo, taken in 1922. The Pennsylvania Railroad's class I1s steam locomotives were the largest class of 2-10-0 "Decapods" built in th..
PRR K4s
A K4s-hauled train pauses at Aberdeen, Maryland on 1944-04-26. This is the classic prewar K4s configuration. PRR K4s #8212 in 1920. This locomotive bears the distinctive Lines West smokebox-door headlight, which would be later relocated higher. First K4s prototype #1737 in its offici..
PRR K5
The Pennsylvania Railroad's class K5 was an experimental 4-6-2 "Pacific" type, built in 1929 to see if a larger Pacific than the standard K4s was worthwhile. Two prototypes were built, #5698 at the PRR's own Altoona Works, and #5699 by the Baldwin Locomotive Works. Although classified identically,..
PRR L5
The Pennsylvania Railroad's class L5 were the railroad's second generation of production electric locomotives after the DD1, and the last to use a jackshaft and side rods to drive the wheels. The L5 was a single-unit locomotive instead of the twin-unit DD1. Thirteen were built. One was an AC unit..
PRR L6
The Pennsylvania Railroad's class L6 comprised two electric locomotives of 2-8-2 wheel arrangement in the Whyte notation. THe intention was to build a whole class of freight boxcab locomotives using this design, but the displacement of class P5a to freight work after the success of the GG1 meant th..
PRR locomotive classification
Locomotive classification on the Pennsylvania Railroad took several forms. Early on, steam locomotives were given single-letter classes. As the 26 letters were quickly assigned, that scheme was abandoned for a more complex system. This was used for all of the PRR's steam locomotives, and — wi..
PRR M1
PRR M1a on display at the 1939 World's Fair. Pipe on the smokebox and box behind stack are components of the feedwater heater. PRR M1 #6891 in 1933. Note the outside steam delivery pipes from smokebox to cylinders, absent on the M1a/M1b, the single air compressor, and the smaller tender. ..
PRR N1s
PRR N1s #7246 at Youngstown, Ohio in 1919, when less than a year old. Note the Lines West central headlight (later relocated higher) and high slope-sided tender coal space. PRR N1s #8363 in its official builders' photo. The Pennsylvania Railroad's N1s was a class of steam locomotive bu..
PRR N2sa
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 lo..
PRR O1
The Pennsylvania Railroad's class O1 was used by eight experimental electric locomotives. They had the wheel arrangement classified as 4-4-4 in the Whyte notation, or 2'B2' in the UIC classification scheme. References ..
PRR Odd D 10003
Pennsylvania Railroad's Odd D #10003 was an experimental electric locomotive built in 1907 of 4-4-0 wheel arrangement in the Whyte notation, or 2-B in the AAR scheme. On the PRR, class D was assigned to 4-4-0 locomotives. Production classes of locomotive were assigned a number after the letter, bu..
PRR P5
The Pennsylvania Railroad's P5 class locomotives were a set of mixed-traffic electric locomotives. Although the original intention was that they work many passenger trains, the success of the GG1 locomotives meant that the P5 class were mostly used on freight. They had a wheel arrangement of 4-6-4..
PRR Q1
The Pennsylvania Railroad's class Q1 comprised a single experimental steam locomotive for freight service, #6130, built in March 1942. A duplex locomotive, it had a wheel arrangement of 4-6-4-4, comprising a four-wheel leading truck, two sets of four and six driving wheels mounted in a rigid loco..
PRR Q2
The Pennsylvania Railroad's class Q2 comprised one prototype and twenty-five production duplex steam locomotives of 4-4-6-4 wheel arrangement. They were the largest non-articulated locomotives ever built and the most powerful locomotives ever static tested, producing 7,987 hp on the PRR's static..
PRR R1
Pennsylvania Railroad class R1 comprised a single prototype electric locomotive of 4-8-4 wheel arrangement in the Whyte notation, 2-D-2 in the AAR standards and 2'Do2' in the UIC classification. It was built as a competitor to the GG1 design, and narrowly lost as it did not ride quite as smoothly. ..
PRR S1
The Pennsylvania Railroad's class S1 comprised a single steam locomotive of 6-4-4-6 wheel arrangement in the Whyte notation, the only locomotive of such arrangement ever constructed. The S1 was a duplex locomotive: it had two pairs of cylinders, each driving two pairs of driving wheels, but its dr..
PRR S2
The single S2, #6200, in a PRR promotional image. The Pennsylvania Railroad's class S2 was a steam turbine locomotive. Only one prototype was built, #6200. The S2 was the sole example of the 6-8-6 wheel arrangement in the Whyte notation, featuring a six-wheel leading truck, eight driving wh..
PRR T1
A T1 at the Baldwin plant ready for delivery to the PRR. The Pennsylvania Railroad's 52 T1 class duplex-drive 4-4-4-4 steam locomotives, introduced in 1942 (2 prototypes) and 1946 (50 production) were their last-built steam locomotives, and their most controversial. They were ambitious, techno..
PR rating
The PR rating system was developed by AMD in the mid-1990s as a method of comparing their x86 processors to those of rival Intel. The letters PR stood for "Performance Rating", but many people make the mistake of thinking that it stood for "Pentium Rating", as the PR rating was often used to measure..
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