6× 625 hp (466 kW) AC motors;[2][4] plus 4× 375 hp (280 kW) motors on the trucks on P5b[3]
Transmission
AC current fed via transformer tap changers to paired motors geared (25:97) to quill drives on each driving axle;[2][4] plus single motors geared to driving axles on end trucks on P5b (gear ratio: 17:50)[3]
The first P5s were built with box cabs. A grade crossing accident in which the crew were killed led to the substitution of a central cab to give better crash protection, a streamlined steeple type, in later production, a design which was also applied to the GG1.
Table of P5 locomotive production
Year
Builder
Bodystyle
Road numbers
Notes
1931
Altoona
Boxcab
7898-7899
Class P5, Renumbered 4700 & 4791 respectively in 1933
1932
Westinghouse
4701–4732
4702 rebuilt to P5b in 1937
General Electric
4755–4774
4770 rebuilt as Modified in 1945
1933
Westinghouse
4733-4742
1934
Altoona
Modified
4780
1935
Westinghouse
4743–4754
General Electric
4775-4779
Altoona
4781-4790
When the GG1s were put in passenger service, the P5s were regeared and used in freight service for many years. The last of the class was withdrawn from service in April 1965.[5]
P5 prototypes
Two prototype locomotives were outshopped from the PRR's Altoona Works in 1931.[1] They were essentially the PRR's 2-B-2 O1 design lengthened by adding another pair of driving wheels; while the O1 was an "electric Atlantic" equivalent to the E6s steam locomotive, the P5 was an "electric Pacific" designed to match or better the performance of the PRR's ubiquitous K4s Pacifics.
These prototypes had electrical equipment from both Westinghouse and General Electric; the design was by both companies and the PRR's electrical department, and the equipment from each manufacturer was identical.
P5a production locomotives
Orders were placed for 90 production locomotives classified P5a due to minor changes from the prototypes (notably, larger traction motor blowers).[1] Production was split between General Electric and Westinghouse; the GE examples were assembled at GE's Erie, Pennsylvania facility, still a locomotive assembly plant today, while final assembly for the Westinghouse order was subcontracted to the Baldwin Locomotive Works.
P5a (modified) steeplecabs
A fatal grade crossing accident on the New York Division confirmed traincrews' concerns about safety when the crew were killed after colliding with a truckload of apples.[1] A redesign was undertaken, giving the locomotives a central cab, raised higher, with narrower-topped, streamlined "noses" to the locomotive to enable the crew to see forward. The final 28 locomotives were built to this design, which was not given a separate class designation since it was mechanically and electrically identical; they were called class P5a (modified), and colloquially Modifieds.[1]
P5a (modified) #4780
Documentation published in 2010 disproved the decades long belief that the modified P5's new shell design came first and was then applied to the GG1, R1, and eventually the DD2. Instead, it was revealed that the GG1 project, under the direction of industrial designer Donald R. Dohner, was the first to receive the center cab design, and that soon afterward it was applied to the R1 and P5.[6]
The Modified units (along with the R1 and prototype GG1) were built with riveted carbodies. However, unit #4770, rebuilt to a Modified appearance in January 1945 after being wrecked in February 1944,[7][8] differed from previous Modifieds in having an all-welded carbody, the type of construction famously utilized in the production run of the GG1.[9]
P5b experiment
In October 1937, P5a #4702 was rebuilt with motors in its trucks to become the only locomotive in subclass P5b. Each truck axle was given a 375-horsepower (280 kW) motor,[3] adding 1,500 hp (1,100 kW) to give a total power output of 5,250 hp (3,910 kW) and a wheel arrangement of B-C-B or Bo′CoBo′. The main drivers had used double traction motors [de] on each axle, but the trucks were a single motor per axle. This modification also meant that locomotive's entire weight was carried on driven wheels. Despite these advantages the experiment was not repeated, however #4702 continued in its modified form.
Visually, the class P5b could be distinguished from a boxcab P5a by having a lower row of ventilation grilles on the sides of the superstructure, and by having outside brake cylinders on the trucks.[1]
^ abcdefgStaufer, Alvin F.; Pennypacker, Bert (1962). Pennsy Power: Steam and Electric Locomotives of the Pennsylvania Railroad, 1900-1957. Research by Martin Flattley. Carollton, Ohio: Alvin F. Staufer. p. 298. ISBN978-0-9445-1304-0.
^Pennsylvania Railroad Technical and Historical Society (August 2004). "PRR Chronology 1965" (PDF). Retrieved 2008-08-30.
^Wayt, Hampton C. (Fall 2010). "Update on the GG1's genesis". Classic Trains (Kalmbach) 11 (3): 86–87.
^"2 Killed as 90 Car Freight Speeds Past Flagman and Plows Into Standing train". Philadelphia Inquirer. February 14, 1944. p. 1.
^Interstate Commerce Commission. Investigation no. 2774 The Pennsylvania Railroad Company report in re accident near Roxton, Pa., on February 13, 1944. OCLC 947002343.
^Volkmer, William D. (1991). Pennsy Electric Years. Edison, New Jersey: Morning Sun Books. pp. 26–27. ISBN1-878887-01-7.
January 07, 2023
pennsylvania, railroad, class, redirects, here, planned, mars, spacecraft, amsat, current, projects, pennsylvania, railroad, class, comprised, mixed, traffic, electric, locomotives, constructed, 1931, 1935, westinghouse, general, electric, although, original, . P5A redirects here For a planned Mars spacecraft see AMSAT Current projects The Pennsylvania Railroad s class P5 comprised 92 mixed traffic electric locomotives constructed 1931 1935 by the PRR Westinghouse and General Electric 1 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 A single survivor prototype 4700 is at the National Museum of Transportation in St Louis Missouri PRR P5 P5aPRR P5a 4761Type and originPower typeElectricBuilderPRR Altoona Works 13 Baldwin Westinghouse 54 General Electric 25 1 Build date1931 1935Total produced92SpecificationsConfiguration Whyte4 6 4 AAR2 C 2 UIC2 Co2 Gauge4 ft 8 1 2 in 1 435 mm standard gaugeLeading dia 36 in 914 mm 2 3 4 Driver dia 72 in 1 829 mm 2 3 4 Trailing dia 36 in 914 mm 2 3 4 Wheelbase49 ft 10 in 15 19 m total 20 ft 6 10 m rigid 2 3 4 Length62 ft 19 m 2 3 4 Width10 ft 6 in 3 20 m P5 P5a P5b 2 3 10 ft 8 25 in 3 26 m P5a modified 4 Height15 ft 4 57 m over locked down pantographs 2 3 4 Axle load74 000 lb 34 000 kg 34 t P5 P5a 2 77 800 lb 35 300 kg 35 3 t P5b 3 77 000 lb 35 000 kg 35 t P5a modified 4 Adhesive weight220 000 lb 100 000 kg 100 t P5 P5a 2 444 700 lb 201 700 kg 201 7 t P5b all wheels driven 3 229 000 lb 104 000 kg 104 t P5a modified 4 Loco weight392 000 lb 178 000 kg 178 t P5 P5a 2 444 700 lb 201 700 kg 201 7 t P5b 3 394 000 lb 179 000 kg 179 t P5a modified 4 Electric system s11 kV AC 25 Hz CatenaryCurrent pickup s PantographTraction motors6 625 hp 466 kW AC motors 2 4 plus 4 375 hp 280 kW motors on the trucks on P5b 3 TransmissionAC current fed via transformer tap changers to paired motors geared 25 97 to quill drives on each driving axle 2 4 plus single motors geared to driving axles on end trucks on P5b gear ratio 17 50 3 CareerOperatorsPennsylvania RailroadNumbers4700 4791Preserved4700DispositionOne P5 prototype preserved rest scrapped They had an AAR wheel arrangement of 2 C 2 or 2 Co2 in the UIC classification system three pairs of driven wheels rigidly mounted to the locomotive with a two axle unpowered truck at each end This is an equivalent to a 4 6 4 in the Whyte notation 2 3 4 The PRR did not have any 4 6 4 steam locomotives so the P5s were the only 4 6 4 type locomotives owned by the PRR The first P5s were built with box cabs A grade crossing accident in which the crew were killed led to the substitution of a central cab to give better crash protection a streamlined steeple type in later production a design which was also applied to the GG1 Table of P5 locomotive production Year Builder Bodystyle Road numbers Notes1931 Altoona Boxcab 7898 7899 Class P5 Renumbered 4700 amp 4791 respectively in 19331932 Westinghouse 4701 4732 4702 rebuilt to P5b in 1937General Electric 4755 4774 4770 rebuilt as Modified in 19451933 Westinghouse 4733 47421934 Altoona Modified 47801935 Westinghouse 4743 4754General Electric 4775 4779Altoona 4781 4790When the GG1s were put in passenger service the P5s were regeared and used in freight service for many years The last of the class was withdrawn from service in April 1965 5 P5 prototypes EditTwo prototype locomotives were outshopped from the PRR s Altoona Works in 1931 1 They were essentially the PRR s 2 B 2 O1 design lengthened by adding another pair of driving wheels while the O1 was an electric Atlantic equivalent to the E6s steam locomotive the P5 was an electric Pacific designed to match or better the performance of the PRR s ubiquitous K4s Pacifics These prototypes had electrical equipment from both Westinghouse and General Electric the design was by both companies and the PRR s electrical department and the equipment from each manufacturer was identical P5a production locomotives EditOrders were placed for 90 production locomotives classified P5a due to minor changes from the prototypes notably larger traction motor blowers 1 Production was split between General Electric and Westinghouse the GE examples were assembled at GE s Erie Pennsylvania facility still a locomotive assembly plant today while final assembly for the Westinghouse order was subcontracted to the Baldwin Locomotive Works P5a modified steeplecabs EditA fatal grade crossing accident on the New York Division confirmed traincrews concerns about safety when the crew were killed after colliding with a truckload of apples 1 A redesign was undertaken giving the locomotives a central cab raised higher with narrower topped streamlined noses to the locomotive to enable the crew to see forward The final 28 locomotives were built to this design which was not given a separate class designation since it was mechanically and electrically identical they were called class P5a modified and colloquially Modifieds 1 P5a modified 4780 Documentation published in 2010 disproved the decades long belief that the modified P5 s new shell design came first and was then applied to the GG1 R1 and eventually the DD2 Instead it was revealed that the GG1 project under the direction of industrial designer Donald R Dohner was the first to receive the center cab design and that soon afterward it was applied to the R1 and P5 6 The Modified units along with the R1 and prototype GG1 were built with riveted carbodies However unit 4770 rebuilt to a Modified appearance in January 1945 after being wrecked in February 1944 7 8 differed from previous Modifieds in having an all welded carbody the type of construction famously utilized in the production run of the GG1 9 P5b experiment EditIn October 1937 P5a 4702 was rebuilt with motors in its trucks to become the only locomotive in subclass P5b Each truck axle was given a 375 horsepower 280 kW motor 3 adding 1 500 hp 1 100 kW to give a total power output of 5 250 hp 3 910 kW and a wheel arrangement of B C B or Bo CoBo The main drivers had used double traction motors de on each axle but the trucks were a single motor per axle This modification also meant that locomotive s entire weight was carried on driven wheels Despite these advantages the experiment was not repeated however 4702 continued in its modified form Visually the class P5b could be distinguished from a boxcab P5a by having a lower row of ventilation grilles on the sides of the superstructure and by having outside brake cylinders on the trucks 1 See also EditPRR locomotive classificationReferences Edit a b c d e f g Staufer Alvin F Pennypacker Bert 1962 Pennsy Power Steam and Electric Locomotives of the Pennsylvania Railroad 1900 1957 Research by Martin Flattley Carollton Ohio Alvin F Staufer p 298 ISBN 978 0 9445 1304 0 a b c d e f g h i j k l m Pennsylvania Railroad P5 amp P5a PRR Locomotive Diagrams Retrieved 2008 08 29 a b c d e f g h i j k l m n Pennsylvania Railroad P5b PRR Locomotive Diagrams Retrieved 2008 08 29 a b c d e f g h i j k l m Pennsylvania Railroad P5a modified PRR Locomotive Diagrams Retrieved 2008 08 29 Pennsylvania Railroad Technical and Historical Society August 2004 PRR Chronology 1965 PDF Retrieved 2008 08 30 Wayt Hampton C Fall 2010 Update on the GG1 s genesis Classic Trains Kalmbach 11 3 86 87 2 Killed as 90 Car Freight Speeds Past Flagman and Plows Into Standing train Philadelphia Inquirer February 14 1944 p 1 Interstate Commerce Commission Investigation no 2774 The Pennsylvania Railroad Company report in re accident near Roxton Pa on February 13 1944 OCLC 947002343 Volkmer William D 1991 Pennsy Electric Years Edison New Jersey Morning Sun Books pp 26 27 ISBN 1 878887 01 7 Retrieved from https en wikipedia org w index php title Pennsylvania Railroad class P5 amp oldid 1130172928, wikipedia, wiki, book, books, library,
