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The Pennsylvania Railroad's class HH1s comprised a single 2-8-8-2 type steam locomotive. Unlike most Pennsylvania Railroad steam locomotives, it had a wagon-top boiler. It was built by the American Locomotive Company (ALCO) in 1911. For 17 years, the single HH1s served as a helper until 1928. It had the road number 3396 and was subsequently scrapped after it was taken out of service in 1928.

Pennsylvania Railroad

Cornish Riviera Limited, 6002 King George IV (CJ Allen, Steel Highway, 1928)

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Locomotives of the Pennsylvania Railroad
A (0-4-0): A1A2A3A4A5A6
B (0-6-0): B1 (s)B2B3B4B5B6B7B8B1 (e)B28B29
C (0-8-0): C1C29C30C31
D (4-4-0): D1D2D3D4D5D6D7D8D9D10D11D12D13D14D15D16D17D18D19D20D21D22D23D24D25D26D27D27D28D28D29D30D31D32D33D34D35D36D37D38D39D61"Odd D" #10003
E (4-4-2): E1E2E3E4E5E6E7E21E22E23E28de Glehn
F (2-6-0): F1F2F3F21F22F23F24F25F26F27F30F31F61
G (4-6-0): G1G2G3G4G5G53
H (2-8-0): H1H2H3H4H5H6H7H8H9H10
I (2-10-0): I1s
J (2-6-2 and 2-10-4): J1J28
K (4-6-2): K1K2K3K4K5K21sK28sK29s
L (2-8-2): L1sL2sL5L6
M (4-8-2): M1
N (2-10-2): N1sN2s
O (4-4-4): O1
P (4-6-4): P5
Q (4-6-4-4 and 4-4-6-4): Q1Q2
R (4-8-4): R1
S (6-4-4-6 and 6-8-6): S1S2
T (4-4-4-4): T1
Articulated steam locomotives: CC1sCC2sHC1sHH1HH1sHH2s
Articulated electric locomotives: AA1BB1BB2BB3DD1DD2FF1FF2GG1
Non-standard: E2bE3bE3cE44
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