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PRR Steam and Electric Classification
A: 0-4-0
Class A was the 0-4-0 type, an arrangement best suited to small switchers. Most railroads abandoned the 0-4-0 after the 1920s, but the PRR kept it alive for use on small industrial branches, especially those with street trackage and tight turns.
A1
A2
A3
A4
A5s

B: 0-6-0
Class B comprised the 0-6-0 type, the most popular arrangement for switchers on the PRR.
B1
B2
B3
B4
B5 - Rebuilt from class H1 and H2a 2-8-0
B6
B7 - Some rebuilt from class H3, H3a, and H3b 2-8-0
B8
B21
B22
B23
B28s
B29

C: 0-8-0
Class C was assigned to the 0-8-0 type. These were very common on other railroads, but the PRR was not keen on them and only built a few. This was partly because the PRR used 2-8-0 "Consolidation" types for similar service.
C1 - Largest 2-cylinder 0-8-0 ever built.
C29
C30
C31

D: 4-4-0
Class D was the 4-4-0 "American" type, the most common arrangement in 19th Century American railroading. 4-4-0s stayed in service on the PRR in secondary work later than on most other railroads, and three were in use until after World War II.
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15 - Compound
D16
D21 - ex-Vandalia Railroad, built by Baldwin 1871-1873
D22 - ex-Vandalia Railroad, built by Pittsburgh 1883-1889
D23 - ex-Vandalia Railroad, built by Pittsburgh 1884
D24 - ex-Vandalia Railroad, built by Rogers 1887
D25 - ex-Vandalia Railroad, built by Pittsburgh 1890
D26 - ex-Vandalia Railroad, built by Schenectady 1895-1899
D30 - ex-Toledo, Walhonding Valley and Ohio Railroad, built by Rome 1890
D31 - ex-Toledo, Walhonding Valley and Ohio Railroad, built 1892-1895
D32 - Compound, ex-Toledo, Walhonding Valley and Ohio Railroad, built by Baldwin 1892
D33
D34 - ex-Cleveland and Marietta Railroad, built by Rome 1885
D35 - ex-Cleveland and Marietta Railroad, built by Rome 1885
D36 - ex-Cleveland and Marietta Railroad, built by Rogers 1885-1886
D37 - ex-Cincinnati, Lebanon and Northern Railway, built by Baldwin 1894
D38 - ex-Cincinnati, Lebanon and Northern Railway, built by Pittsburgh 1899
D39 - ex-Grand Rapids and Indiana Railroad, built by Baldwin 1892-1893
D61 - ex-Cleveland, Akron and Columbus Railway, built by Baldwin 1893
"Odd D" No. 10003, an experimental electric locomotive.

E: 4-4-2
The 4-4-2 "Atlantic" type was assigned class E. The PRR was an enthusiastic user of the Atlantic type in flatter country, and built some of the most advanced Atlantics used in the United States.
E1
E2
E3

E4
E5
E6
E7
E21
E22
E23
E28 - Compound
E29 - Compound

F: 2-6-0
The 2-6-0 "Mogul" type was assigned class F. On the PRR, this type was used during the period of 1895–1925, approximately. They were mostly used to haul express freight, although some hauled suburban passenger trains.
F1
F2 - Compound
F3
F21
F22
F23
F24
F25
F26
F27
F30
F31
F61

G: 4-6-0
G1
G2
G3
G4
G5 - Largest 10 wheeler built. PRR constructed 90 for use in commuter service and then built 30 for their subsidiary the Long Island RR.
G53 - Owned By subsidiary Long Island RR

H: 2-8-0
H1
H2
H3
H4
H5
H6
H8
H9
H10


I: 2-10-0
The 2-10-0 "Decapod" type was assigned class I. The PRR only owned one type of Decapod, class I1s, but they owned 598 of them, one of the largest classes of identical power in the United States.
I1s - heavy freight hauler.

J: 2-6-2 and 2-10-4
Class J was first used for two experimental 2-6-2 "Prairie" locomotives built by ALCO in 1905. These were both withdrawn from service by the mid-1920s. In 1942, the PRR built 250 2-10-4 "Texas" type locomotives based on C&O plans; class J now being unoccupied, it was reused for them. The PRR J1 was an improved version of its C&O counterpart with more pulling power.
J1 - 2-10-4 freight locomotives.
J28 - experimental 2-6-2 locomotives.

K: 4-6-2
The PRR assigned class K to the 4-6-2 "Pacific" type. The Pacific was the most common type of passenger locomotive on the Pennsylvania.
K2 - 153 built at Altoona 1910-1911
K29s - 1 built
K3s - 30 built by Baldwin in 1913.
K4s - 425 built by the PRR and Baldwin 1914-1928.
K5 - 2 prototypes built

L: 2-8-2
Class L was assigned to the 2-8-2 "Mikado" type.
L1s - freight twin to the famed K4s Pacific (575 built)
L2s - the USRA standard light Mikado (5 built for PRR).
L5 - PRR 2nd generation DC electric locomotive.
L6 - PRR freight AC electric locomotives.

M: 4-8-2
M1 - mixed-traffic Mountain type, latterly mostly used on fast freight.

N: 2-10-2
N1s - Lines West heavy freight locomotive.
N2s - USRA Standard 2-10-2, also used on Lines West.
N2sa - A rebuild of the U.S.R.A.

O: 4-4-4
The 4-4-4 arrangement was rare anywhere, and on the PRR it was found only on eight experimental electric locomotives.
O1 - experimental electric locomotives.

P: 4-6-4
The 4-6-4 arrangement was seen on the PRR only on electric locomotives. As a steam locomotive arrangement, it was poorly suited to the PRR's mountainous terrain, wasting much potential adhesive weight on non-driven wheels. That it was so widely used by the rival New York Central would also likely have factored against PRR adoption.
P5 - mixed-traffic electric locomotive.

Q: 4-4-6-4 or 4-6-4-4
The Q class comprised what were effectively 4-10-4s with the driving axles split into two driven groups. The Q2 was the most powerful non-articulated steam locomotive ever built and also holds the record for highest horsepower recorded by any steam locomotive at 7,987 hp.
Q1 - experimental duplex freight locomotive.
Q2 - duplex freight locomotive.

R: 4-8-4
The PRR never built any steam locomotives of the 4-8-4 "Northern" type, although the T1 duplexes were effectively a "Northern" with the driving wheels split into two groups.
R1 - experimental electric locomotive, surpassed by the GG1.

S: 6-4-4-6 or 6-8-6
Both S class locomotives were originally intended to only have four leading and trailing wheels, but increases in weight required them. In the case of the S2, it was due to wartime limits on the use of advanced steel alloys.
S1 - experimental duplex express passenger locomotive.
S2 - experimental steam turbine locomotive.

T: 4-4-4-4
The duplex-drive T1 was the final class of steam locomotive constructed for the Pennsylvania Railroad, and possibly the most controversial.
T1 - Duplex express passenger locomotive.

Compound classifications
The PRR classified articulated locomotives and joined locomotive units by using multiples of the previous classifications.

Articulated steam:
CC1s - 0-8-8-0 Mallet locomotive. Treated as two 0-8-0s for classification. One built.
CC2s - 0-8-8-0 Mallet locomotive. 10 built.
HC1s - 2-8-8-0 simple articulated locomotive. The PRR's only main-line articulated. One built.
HH1s - 2-8-8-2 Mallet locomotive. Treated for classification purposes as two 2-8-0s back to back.
HH1 - 2-8-8-2 Norfolk & Western class Y3 borrowed by PRR during World War II.

Articulated electric:
AA1 - experimental 0-4-4-0 or B-B electric locomotives.
BB1 - two-unit prototype AC electric 0-6-0+0-6-0 switching locomotive, later split into single units as class B1.
BB2 - two-unit 0-6-0+0-6-0 DC electric switching locomotives, later split into single units as class B1.
BB3 - two-unit 0-6-0+0-6-0 DC electric switching locomotives for LIRR, later split into single units as class B3.
DD1 - two-unit DC electric locomotive, two 4-4-0 half-locomotives semi-permanently coupled back to back. Served between Manhattan Transfer and Penn Station, and to Sunnyside Yard.
DD2 - experimental mixed-traffic AC electric locomotive, similar in overall design and appearance to GG1.
FF1 - 2-6-6-2 (1-C+C-1) experimental electric locomotive, 1917. Too powerful.
FF2 - 2-6-6-2 motor-generator AC electric locomotives acquired second-hand from the Great Northern Railway (their classes Y1 and Y1a) in 1956.
GG1 - express passenger and freight electric locomotive, highly successful.

Non-standard electric classification
E2b - experimental B-B General Electric-built AC electric locomotives (3 pairs built).
E3b - experimental B-B-B Baldwin-Lima-Hamilton-Westinghouse AC/DC rectifier locomotives (1 pair built).
E2c - experimental C-C Baldwin-Lima-Hamilton-Westinghouse AC/DC rectifier locomotives (1 pair built)
E44 - 1960 C-C General Electric AC/DC rectifier freight locomotives.

The horsepower-based designation unique to the E44 would be retained and expanded by Penn Central to cover the former New Haven EF4s (E33) and EP5s (E40).

Diesel classification
The Pennsylvania Railroad was slow to dieselize. By the end of WW2 they only had 18 units. However over the next 22 years they had acquired a total of 3,005 units. They bought from all the manufacturers: Alco 516 units, Baldwin 643 units, EMD 1,479 units, Fairbanks-Morse 200 units, General Electric 145 units, and Lima 22 units. This diversity was a nightmare for the maintenance department as there was very little compatibility among the different builders.

The class number system is as follows:
The first letter stood for the manufacturer; A=Alco, B =Baldwin, G =General Electric, E =EMD, F =Fairbanks-Morse, and L =Lima.
The second and third letters represented the type of service; S =switcher, F =Freight, P =passenger, :: PF=dual service, RS =road-switcher, and H =helper.
The next number(s) were for horse power rounded to hundreds.
The last letter, if used, was for model variations.

PRR 5711 at Chicago Union Station for National Train Day, 2011.
Pennsylvania Railroad Keystone herald.
The Pennsylvania Railroad's mighty T1 was in a class of its own.

Pennsylvania Railroad No. 7002 at the Railroad Museum of Pennsylvania.   

By Photo by and (c)2016 Derek Ramsey (Ram-Man) - Self-photographed, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=47591930

PRR 5711 at Chicago Union Station for National Train Day, 2011.        

By vxla from Chicago, US [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons

PRR E44 Electric Locomotive No. 4432.
Pennsylvania Railroad No. 7002 at the Railroad Museum of Pennsylvania.
General Electric
PRR Class: GS4
Builder’s Model: 44 Ton
Build date: 1948–1950
Total produced: 46
Wheel arrangement: B-B
Service: Switcher
Power output: 400 hp (300 kW)

PRR Class: GF25
Builder’s Model: U25B
Build date: 1965
Total produced: 59
Wheel arrangement: B-B
Service: Freight
Power output: 2,500 hp (1,860 kW)

PRR Class: GF25a
Builder’s Model: U25C
Build date: 1965
Total produced: 20
Wheel arrangement: C-C
Service: Freight
Power output: 2,500 hp (1,860 kW)

PRR Class: GF28a
Builder’s Model: U28C
Build date: 1966
Total produced: 15
Wheel arrangement: C-C
Service: Freight
Power output: 2,800 hp (2,090 kW)

PRR Class: GF30a
Builder’s Model: U30C
Build date: 1967
Total produced: 5
Wheel arrangement: C-C
Service: Freight
Power output: 3,000 hp (2,240 kW)


EMD
PRR Class: ES6
Builder’s Model: SW
Build date: 1937
Total produced: 12
Wheel arrangement: B-B
Service: Switcher
Power output: 600 hp (450 kW)

PRR Class: ES6
Builder’s Model: SW1
Build date: 1942–1950
Total produced: 85
Wheel arrangement: B-B
Service: Switcher
Power output: 600 hp (450 kW)

PRR Class: ES10
Builder’s Model: NW2
Build date: 1941–1948
Total produced: 32
Wheel arrangement: B-B
Service: Switcher
Power output: 1,000 hp (750 kW)

PRR Class: ES12
Builder’s Model: SW7-SW9
Build date: 1950–1953
Total produced: 84
Wheel arrangement: B-B
Service: Switcher
Power output: 1,200 hp (890 kW)

PRR Class: ES12
Builder’s Model: SW1200
Build date: 1957
Total produced: 35
Wheel arrangement: B-B
Service: Switcher
Power output: 1,200 hp (890 kW)

PRR Class: EF15
Builder’s Model: F3A,F7A
Build date: 1947–1952
Total produced: 203
Wheel arrangement: B-B
Service: Freight
Power output: 1,500 hp (1,120 kW)
Note: Cab A unit

PRR Class: EF15
Builder’s Model: F3B,F7B
Build date: 1947–1952
Total produced: 107
Wheel arrangement: B-B
Service: Freight
Power output: 1,500 hp (1,120 kW)
Note: Cab B unit

PRR Class: EPF15
Builder’s Model: FP7A
Build date: 1952
Total produced: 40
Wheel arrangement: B-B
Service: Passenger
Power output: 1,500 hp (1,120 kW)
Note: Cab A unit

PRR Class: EPF15
Builder’s Model: FP7B
Build date: 1952
Total produced: 14
Wheel arrangement: B-B
Service: Passenger
Power output: 1,500 hp (1,120 kW)
Note: Cab B unit

PRR Class: EP20
Builder’s Model: E7A
Build date: 1945–1949
Total produced: 46
Wheel arrangement: A1A-A1A
Service: Passenger
Power output: 2,000 hp (1,490 kW)
Note: Cab A unit

PRR Class: EP20
Builder’s Model: E7B
Build date: 1945–1949
Total produced: 14
Wheel arrangement: A1A-A1A
Service: Passenger
Power output: 2,000 hp (1,490 kW)
Note: Cab B unit

PRR Class: EP22
Builder’s Model: E8A
Build date: 1950–1952
Total produced: 74
Wheel arrangement: A1A-A1A
Service: Passenger
Power output: 2,250 hp (1,680 kW)
Note: Cab A unit

PRR Class: ERS15
Builder’s Model: GP7
Build date: 1952–1953
Total produced: 66
Wheel arrangement: B-B
Service: Freight
Power output: 1,500 hp (1,120 kW)
Note: 10 units used in Passenger service

PRR Class: ERS15ax
Builder’s Model: SD7
Build date: 1953
Total produced: 2
Wheel arrangement: B-B
Service: Freight
Power output: 1,500 hp (1,120 kW)

PRR Class: ERS17
Builder’s Model: GP9
Build date: 1955–1959
Total produced: 310
Wheel arrangement: B-B
Service: Freight
Power output: 1,750 hp (1,300 kW)
Note: 40 units no cab

PRR Class: ERS17a
Builder’s Model: SD9
Build date: 1957–1958
Total produced: 25
Wheel arrangement: C-C
Service: Freight
Power output: 1,750 hp (1,300 kW)

PRR Class: EF22
Builder’s Model: GP30
Build date: 1963
Total produced: 52
Wheel arrangement: B-B
Service: Freight
Power output: 2,250 hp (1,680 kW)

PRR Class: EF25
Builder’s Model: GP35
Build date: 1964–1965
Total produced: 119
Wheel arrangement: B-B
Service: Freight
Power output: 2,500 hp (1,860 kW)

PRR Class: EF25a
Builder’s Model: SD35
Build date: 1965
Total produced: 40
Wheel arrangement: C-C
Service: Freight
Power output: 2,500 hp (1,860 kW)

PRR Class: EF30a
Builder’s Model: SD40
Build date: 1966
Total produced: 65
Wheel arrangement: C-C
Service: Freight
Power output: 3,000 hp (2,240 kW)

PRR Class: EF36
Builder’s Model: SD45
Build date: 1966
Total produced: 65
Wheel arrangement: C-C
Service: Freight
Power output: 3,600 hp (2,680 kW)

PRR Class: EF20a
Builder’s Model: GP38
Build date: 1967
Total produced: 5
Wheel arrangement: B-B
Service: Freight
Power output: 2,000 hp (1,490 kW)
Note: Built for Pennsylvania-RSL



Fairbanks-Morse
PRR Class: FS10
Builder’s Model: H10-44
Build date: 1948–1949
Total produced: 55
Wheel arrangement: B-B
Service: Switcher
Power output: 1,000 hp (750 kW)
  
PRR Class: FS12
Builder’s Model: H12-44
Build date: 1952–1954
Total produced: 16
Wheel arrangement: B-B
Service: Switcher
Power output: 1,200 hp (890 kW)

PRR Class: FF20
Builder’s Model: Erie Built
Build date: 1947–1948
Total produced: 36
Wheel arrangement: A1A-A1A
Service: Freight
Power output: 2,000 hp (1,490 kW)
Note: Cab A

PRR Class: FF20
Builder’s Model: Erie Built
Build date: 1947–1948
Total produced: 12
Wheel arrangement: A1A-A1A
Service: Freight
Power output: 2,000 hp (1,490 kW)
Note: Cab B

PRR Class: FF16
Builder’s Model: CF-16-4
Build date: 1950
Total produced: 16
Wheel arrangement: B-B
Service: Freight
Power output: 1,600 hp (1,190 kW)
Note: Cab A

PRR Class: FF16
Builder’s Model: CF-16-4
Build date: 1950
Total produced: 8
Wheel arrangement: B-B
Service: Freight
Power output: 1,600 hp (1,190 kW)
Note: Cab B

PRR Class: FRS-16
Builder’s Model: H16-44
Build date: 1952
Total produced: 10
Wheel arrangement: B-B
Service: Freight
Power output: 1,600 hp (1,190 kW)

PRR Class: FRS-20
Builder’s Model: H20-44
Build date: 1948–1951
Total produced: 38
Wheel arrangement: B-B
Service: Freight
Power output: 2,000 hp (1,490 kW)

PRR Class: FRS-24
Builder’s Model: H24-66
Build date: 1953–1954
Total produced: 9
Wheel arrangement: C-C
Service: Freight
Power output: 2,400 hp (1,790 kW)
Note: aka Train Master

The Pennsylvania Railroad's mighty T1 was in a class of its own.

Classic Streamliners - TRAIN​CYCLOPEDIA

Alco
PRR Class: AS6
Builder’s Model: S-1
Build date: 1947–1951
Total produced: 40
Wheel arrangement: B-B
Service: Switcher
Power output: 600 hp (450 kW)


PRR Class: AS10
Builder’s Model: S-2
Build date: 1948–1954
Total produced: 90
Wheel arrangement: B-B
Service: Switcher
Power output: 1,000 hp (750 kW)
Note: 22 units MU class AS10m

PRR Class: AS10a
Builder’s Model: T-6
Build date: 1958
Total produced: 6
Wheel arrangement: B-B
Service: Switcher
Power output: 1,000 hp (750 kW)

PRR Class: AF15
Builder’s Model: FA-1
Build date: 1948–1950
Total produced: 8
Wheel arrangement: B-B
Service: Freight
Power output: 1,500 hp (1,120 kW)

PRR Class: AF15
Builder’s Model: FB-1
Build date: 1948–1950
Total produced: 8
Wheel arrangement: B-B
Service: Freight
Power output: 1,500 hp (1,120 kW)

PRR Class: AF16
Builder’s Model: FA-2
Build date: 1951
Total produced: 24
Wheel arrangement: B-B
Service: Freight
Power output: 1,600 hp (1,190 kW)

PRR Class: AF16
Builder’s Model: FA-2
Build date: 1951
Total produced: 12
Wheel arrangement: B-B
Service: Freight
Power output: 1,600 hp (1,190 kW)

PRR Class: AFP20
Builder’s Model: PA-1
Build date: 1947
Total produced: 10
Wheel arrangement: A1A-A1A
Service: Passenger
Power output: 2,000 hp (1,490 kW)
Note: many converted to Freight

PRR Class: AFP20
Builder’s Model: PB-2
Build date: 1947
Total produced: 5
Wheel arrangement: A1A-A1A
Service: Passenger
Power output: 2,000 hp (1,490 kW)
Note: many converted to Freight

PRR Class: ARS10
Builder’s Model: RS-1
Build date: 1948–1952
Total produced: 27
Wheel arrangement: B-B
Service: Freight
Power output: 1,000 hp (750 kW)
Note: 5 units used in Passenger service

PRR Class: ARS15
Builder’s Model: RS-2
Build date: 1948
Total produced: 6
Wheel arrangement: B-B
Service: Freight
Power output: 1,500 hp (1,120 kW)
Note: ex D&H

PRR Class: ARS16
Builder’s Model: RS-3
Build date: 1951–1955
Total produced: 115
Wheel arrangement: B-B
Service: Freight
Power output: 1,600 hp (1,190 kW)
Note: 45 units used in Passenger service

PRR Class: ARS16a
Builder’s Model: RSD-4
Build date: 1952–1953
Total produced: 6
Wheel arrangement: C-C
Service: Freight
Power output: 1,600 hp (1,190 kW)

PRR Class: ARS18
Builder’s Model: RS-11
Build date: 1956–1957
Total produced: 32
Wheel arrangement: B-B
Service: Freight
Power output: 1,800 hp (1,340 kW)

PRR Class: ARS18a
Builder’s Model: RSD-12
Build date: 1957–1958
Total produced: 25
Wheel arrangement: C-C
Service: Freight
Power output: 1,800 hp (1,340 kW)

PRR Class: ARS20
Builder’s Model: RS-11
Build date: 1956–1957
Total produced: 6
Wheel arrangement: B-B
Service: Freight
Power output: 2,000 hp (1,490 kW)

PRR Class: ARS24
Builder’s Model: RSD-15
Build date: 1956
Total produced: 6
Wheel arrangement: C-C
Service: Freight
Power output: 2,400 hp (1,790 kW)

PRR Class: ARS24s
Builder’s Model: RSD-7
Build date: 1955–1956
Total produced: 5
Wheel arrangement: C-C
Service: Passenger
Power output: 2,400 hp (1,790 kW)

PRR Class: ARS24
Builder’s Model: RS-27
Build date: 1962
Total produced: 15
Wheel arrangement: C-C
Service: Freight
Power output: 2,400 hp (1,790 kW)

PRR Class: AF24
Builder’s Model: C-424
Build date: 1962
Total produced: 1
Wheel arrangement: C-C
Service: Freight
Power output: 2,400 hp (1,790 kW)

PRR Class: AF25
Builder’s Model: C-425
Build date: 1964–1965
Total produced: 31
Wheel arrangement: C-C
Service: Freight
Power output: 2,500 hp (1,860 kW)

PRR Class: AF27
Builder’s Model: C-628
Build date: 1965
Total produced: 15
Wheel arrangement: C-C
Service: Freight
Power output: 2,750 hp (2,050 kW)

PRR Class: AF30
Builder’s Model: C-630
Build date: 1966
Total produced: 15
Wheel arrangement: C-C
Service: Freight
Power output: 3,000 hp (2,240 kW)

PRR Class: AF36
Builder’s Model: C-636
Build date: 1968
Total produced: 15
Wheel arrangement: C-C
Service: Freight
Power output: 3,600 hp (2,680 kW)
Note: ordered but delivered to PC

Baldwin Locomotive Works
PRR Class: BS6
Builder’s Model: VO-660
Build date: 1942–1945
Total produced: 12
Wheel arrangement: B-B
Service: Switcher
Power output: 600 hp (450 kW)

PRR Class: BS6
Builder’s Model: DS-4-4-660
Build date: 1942–1945
Total produced: 99
Wheel arrangement: B-B
Service: Switcher
Power output: 660 hp (490 kW)

PRR Class: BS7
Builder’s Model: DS-4-4-750
Build date: 1951
Total produced: 24
Wheel arrangement: B-B
Service: Switcher
Power output: 750 hp (560 kW)

PRR Class: BS7
Builder’s Model: S8
Build date: 1951
Total produced: 7
Wheel arrangement: B-B
Service: Switcher
Power output: 750 hp (560 kW)

PRR Class: BS10
Builder’s Model: VO
Build date: 1943–1945
Total produced: 8
Wheel arrangement: B-B
Service: Switcher
Power output: 1,000 hp (750 kW)

PRR Class: BS10
Builder’s Model: DS-4-4-1000
Build date: 1948–1950
Total produced: 137
Wheel arrangement: B-B
Service: Switcher
Power output: 1,000 hp (750 kW)

PRR Class: BS12
Builder’s Model: S-12
Build date: 1951–1956
Total produced: 98
Wheel arrangement: B-B
Service: Switcher
Power output: 1,200 hp (890 kW)

PRR Class: BF15
Builder’s Model: DR-4-4-1500
Build date: 1940–1950
Total produced: 34
Wheel arrangement: B-B
Service: Freight
Power output: 1,500 hp (1,120 kW)
Note: Cab (A) aka “Sharknose”

PRR Class: BF15
Builder’s Model: DR-4-4-1500
Build date: 1940–1950
Total produced: 34
Wheel arrangement: B-B
Service: Freight
Power output: 1,500 hp (1,120 kW)
Note: Cab (B)

PRR Class: BF16
Builder’s Model: RF-16 (A)
Build date: 1950–1952
Total produced: 72
Wheel arrangement: B-B
Service: Freight
Power output: 1,600 hp (1,190 kW)
Note: Cab (A) aka “Sharknose”

PRR Class: BF16
Builder’s Model: RF-16 (B)
Build date: 1950–1952
Total produced: 30
Wheel arrangement: B-B
Service: Freight
Power output: 1,600 hp (1,190 kW)
Note: Cab (B)

PRR Class: BP60a
Builder’s Model: DR-12-8-3000
Build date: 1947–1948
Total produced: 24
Wheel arrangement: 2-D-D-2
Service: Passenger
Power output: 3,000 hp (2,240 kW)
Note: converted to helper aka "Centipede"

PRR Class: BP20
Builder’s Model: DR-6-4-2000
Build date: 1948
Total produced: 18
Wheel arrangement: A1A-A1A
Service: Passenger
2,000 hp Power output: (1,490 kW)
Note: Cab (A)

PRR Class: BP20
Builder’s Model: DR-6-4-2000
Build date: 1948
Total produced: 9
Wheel arrangement: A1A-A1A
Service: Passenger
2,000 hp Power output: (1,490 kW)
Note: Cab (B)

PRR Class: BRS10
Builder’s Model: DRS-4-4-1000
Build date: 1949–1950
Total produced: 6
Wheel arrangement: B-B
Service: Passenger
Power output: 1,000 hp (750 kW)

PRR Class: BRS12
Builder’s Model: RS-12
Build date: 1951–1954
Total produced: 8
Wheel arrangement: B-B
Service: Passenger
Power output: 1,200 hp (890 kW)
Note: 3 units used in Passenger service

PRR Class: BRS15
Builder’s Model: DRS-4-4-1500
Build date: 1950
Total produced: 8
Wheel arrangement: B-B
Service: Passenger
Power output: 1,500 hp (1,120 kW)

PRR Class: BRS16
Builder’s Model: AS-616
Build date: 1953–1955
Total produced: 28
Wheel arrangement: C-C
Service: Passenger
Power output: 1,600 hp (1,190 kW)
Note: 16 units used in Passenger service

PRR Class: BRS24
Builder’s Model: RT-624
Build date: 1951–1954
Total produced: 22
Wheel arrangement: C-C
Service: Transfer
Power output: 2,400 hp (1,790 kW)

PRR Class: LRS25
Builder’s Model: T2500
Build date: 1950–1951
Total produced: 22
Wheel arrangement: C-C
Service: Transfer
Power output: 2,500 hp (1,860 kW)
Note: Built by Lima Locomotive Works

PRR E44 Electric Locomotive No. 4432.

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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 — with the exception of the final type bought (the E44) — all electric locomotives also used this scheme.