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HH1s class
Pennsylvania Railroad engine 3396 HH1 Alco.JPG
Postcard depiction of Pennsylvania Railroad #3396.
Type and origin
Power type Steam
Builder ALCO
Build date 1911
Configuration 2-8-8-2
Gauge 4 ft 8 12 in (1,435 mm)
Firebox type wagon-top
Operators Pennsylvania Railroad
Class HH1s
Numbers 3396
Retired 1928
Disposition scrapped

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.