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. These 2-8-8-2 steam locomotives were similar to the Norfolk & Western Class Y3 2-8-8-2s but with some PRR Alterations such as the keystone number plate that was mounted centrally on the small smokebox door and had fitted a little shelter known as a "Doghouse" onto the tender of the locomotive.

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History

The HH1's roots trace back to the Norfolk & Western Railway, where they had once been in charge of general merchandise freight traffic and subsequently helper service. The Pennsylvania Railroad bought six of the N&W class Y3s in 1943. They were used in general freight traffic and helper service on the Pennsylvania Railroad similar to their lives on the Norfolk & Western. They were generally found west of Altoona, Pennsylvania. But their lives on the Pennsylvania were eventually cut short, due to J1 2-10-4 Texas type locomotives, and by 1951, all six of them had been retired from active service and cut up for scrap.

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