PRR AA1

From Wikipedia, the free encyclopedia

PRR AA1
PRR AA1
PRR AA1 #10001[1]
{{{name2}}}
PRR AA1 #10002
Power type Electric
Builder Pennsylvania Railroad Altoona Works[2]
Building partner Westinghouse[1]
Serial number EZN-7, EZN-8[3]
Build date 1905
Total production 2[2]
AAR wheel arr. B-B[1]
Gauge 4 ft 8½ in (1,435 mm)
Wheelbase Truck: 8.5 ft (2.6 m)
Overall: 26 ft (7.9 m)[1]
Total weight 10001: 87 short tons (79 t)
10002: 97 short tons (88 t)[1]
Electric system(s) 600 V DC[1]
Current Collection method(s) Third rail
Locomotive brakes Straight air
Train brakes 26-L air
WikiProject Trains
{{Infobox Locomotive Auto}}

The Pennsylvania Railroad's class AA1 comprised two experimental electric locomotives constructed in 1905 by Westinghouse at the start of the PRR's electrification project.[1][2] They were testbeds for larger locomotives to come. Both were of B-B wheel arrangement in the Association of American Railroads classification scheme; each had two trucks, each with two axles and four wheels.

The first, #10001, used gearless motors attached to the axles. The second, #10002, was built with motors mounted in the truck frames and geared to the wheels. Later on it was given one gearless truck.[1]

Both locomotives proved unstable at speed, pounding the track with high lateral forces. A competing experimental unit, "Odd D" #10003, of 4-4-0 wheel arrangement in Whyte notation or 2-B in the AAR scheme, proved much more stable. It was selected as the basis for the production model, which became the PRR DD1 twin-unit locomotive.

At low speeds in switching service, however, the locomotives were acceptable. The first, #10001, was renumbered #3950 and was sold to the (PRR subsidiary) Long Island Rail Road in 1916. Numbered 323 on that road and nicknamed "Phoebe", the locomotive was in use until 1937 when it was scrapped.[4] No. 10002, meanwhile, was renumbered #3951 and continued in service on the PRR.[5]

[edit] References

  1. ^ a b c d e f g h Burch, Edward Parris (1911). Electric Traction for Railway Trains. New York: McGraw-Hill. 
  2. ^ a b c Staufer, Alvin F. (1962). Pennsy Power. Staufer, 247. LOC 62-20878. 
  3. ^ Britton, Jerry. Electric Class Cross Reference. Keystone Crossings. Retrieved on 2008-05-03.
  4. ^ Keller, David (2005). Revisiting the Long Island Rail Road. Arcadia, 12. ISBN 0738538299. 
  5. ^ Staufer, Alvin F. (1968). Pennsy Power II. Staufer, 124. LOC 62-20872. 
v • d • e
PRR Locomotives
A (0-4-0): A1 · A2 · A3 · A4 · A5s B (0-6-0): B1 · B2 · B3 · B4 · B5 · B6 C (0-8-0): C1 · C29 · C30 · C31
D (4-4-0): D1 · D2 · D3 · D4 · D5 · D6 · D7 · D8 · D9 · D10 · D11 · D12 · D13 · D14 · D15 · D16 · D21 · D22 · D23 · D24 · D25 · D26 · D30 · D31 · D32 · D33 · D34 · D35 · D36 · D37 · D38 · D39 · D61 · "Odd D" #10003
E (4-4-2): E1 · E2 · E3 · E4 · E5 · E6 · E7 · E21 · E22 · E23 · E28
F (2-6-0): F1 · F2 · F3 · F21 · F22 · F23 · F24 · F25 · F26 · F27 · F30 · F31 · F61
G (4-6-0): G1 · G2 · G3 · G4 · G5 · G53 H (2-8-0): H1 · H2 · H3 · H4 · H5 · H6 · H8 · H9 · H10 I (2-10-0): I1s
J (2-6-2 and 2-10-4): J1 · J28 K (4-6-2): K1 · K2 · K3s · K4s · K5 L (2-8-2): L1s · L2s · L5 · L6
M (4-8-2): M1 N (2-10-2): N1s · N2s O (4-4-4): O1
P (4-6-4): P5 Q (4-6-4-4 and 4-4-6-4): Q1 · Q2 R (4-8-4): R1
S (6-4-4-6 and 6-8-6): S1 · S2 T (4-4-4-4): T1
Articulated steam locomotives: CC1s · CC2s · HC1s · HH1s · HH1 Articulated electric locomotives: AA1 · BB1 · BB2 · BB3 · DD1 · DD2 · FF1 · FF2 · GG1 Non-standard: E2b · E3b · E3c · E44
Rail stub icon  This electric locomotive-related article is a stub. You can help Wikipedia by expanding it.