 The original "Derry" in Westmoreland County, Pennsylvania was named after the city Derry in Northern Ireland, because the area’s first non-Indian inhabitants were Scotch-Irish.Derry was ideally suited for major railroad facilities because of its ready access to water from McGee Run (essential in the era of steam locomotives) and because it sits atop a slight summit along the railroad right-of-way.In Derry's heyday in the late 1800s, it had four hotels, mainly to serve railroad workers, as well as a roundhouse for locomotive maintenance and a massive railroad yard.