The Pennsylvania Railroad class HH1 comprised six ex-Norfolk and Western Railway Y3 class 2-8-8-2 steam locomotives.
PRR S1 | PRR L1s | PRR K4s | PRR E6 | PRR GG1 | PRR MP54 | PRR E44 | PRR DD1 | PRR D6 | PRR 3750 | PRR 1361 |