John Foster Tucker III (1950-2008) was a Philadelphia-born rail transit operating official and rail history enthusiast. This collection consists of photographs of trolleys, trains, rails lines, and rail stations in Philadelphia and the city's Pennsylvania suburbs, as well as offices, maintenance shops, and garages used by transit authorities. Most of the collection is devoted to SEPTA, but predecessor companies PTC (Philadelphia Transportation Company) and PSTC (Philadelphia Suburban Transportation Company) are also represented.

The collection consists of official documents produced or used by Ronald DeGraw during his career as a public transit official and transit consultant, materials from pre-SEPTA operators of the Philadelphia transit system that he preserved from loss or destruction, research materials that he amassed for writing his published and projected books, and photographs and ephemera collected out of his interest in the history of transit systems, particularly electric traction lines or what came to be called light rail transit.