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 (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 minor PRR Alterations on them, 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.

History

The HH1's roots trace back to the Norfolk & Western Railway, where they had once been in charge of general merchandise freight traffic as heavy haulers and subsequently helper service as bankers.

The Pennsylvania Railroad bought six of the N&W class Y3s in 1943 and designated their 2-8-8-2s as the "HH1". They were used in general freight traffic and helper service on the Pennsylvania Railroad similar to their lives on the Norfolk & Western.

These 2-8-8-2 Steam locomotives were generally found in the west of Altoona, Pennsylvania.

Fate

Shockingly enough, their careers on the Pennsylvania Railroad were eventually cut short, due to Pennsylvania Railroad's Class J1 2-10-4 Texas type locomotives, and by 1951, all six of them had been retired from active service and they were all sadly broken up for scrap.