Pennsylvania Railroad H&TS

The Pennsylvania Railroad Historical & Technical Society (PRR H&TS) is dedicated to preserving the history and heritage of the Pennsylvania Railroad — once the largest railroad in the United States. Their publications are among the most authoritative resources available on PRR history, covering locomotives, rolling stock, operations, infrastructure, and corporate history in exceptional detail. Essential reading for Pennsy enthusiasts, historians, and modelers seeking accurate prototype reference for their HO or N scale layouts.