The Pennsylvania Railroad 's class HH1s comprised a single 2-8-8-2 type steam locomotive. [2] 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.

Class HH1s (Locobase 325) Data from Wiener (1930) and Roy V Wright, Locomotive Dictionary 1912 (Third) Edition (New York: Simmons-Boardman Company, 1912), Figure 107, p. 192.

The Norfolk and Western Y3 and Y3a classes were classes of 2-8-8-2 "Mallet" articulated steam locomotives, with a total of 80 locomotives built for the Norfolk and Western Railway between 1919 and 1923.

The Pennsylvania Railroad class HH1s/Y3s are four-cylinder compound articulated locomotives that consist of six examples of ex-Norfolk and Western Railway Y3 class 2-8-8-2 (Whyte notation) wheel arrangement.

Feb 11, 2010 · According to Kalmbach’s Guide to North American Steam Locomotives: History and development of steam power since 1900 that original 2-8-8-2 Class HH1/HH1s #3396 had been retired in 1928; PRR reused classification HH1 for the Y3s acquired from Norfolk and Western during Big Brawl Two.

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.

A unique engine on the Pennsy, a simple-expansion articulated built at a time when all other articulateds were Mallet compounds. In a departure from Pennsylvania practice, this engine used a wagon-top boiler. Note the low boiler pressure. She operated in pusher service until 1928.

PRR 3396, HH-1S, 1911 Portraits 7. Here is a steam locomotive portrait of Pennsylvania Railroad engine #3396, an HH-1S (2-8-8-2) steam locomotive built by the American Locomotive Company during September of 1911 and retired in April of 1928 after 17 years of experimental service.

The Pennsylvania Railroad class HH1s/Y3s are four-cylinder compound articulated locomotives that consisted of only just six examples of ex-Norfolk and Western Railway Y3 class 2-8-8-2 wheel arrangement.

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