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Working together every day to enhance the vitality of Center City Philadelphia Center City District Foundation The Center City District Foundation CCDF is the charity of choice for engaged citizens who care deeply about the vitality and competitiveness of Center City. CCDF provides a means to support initiatives of the Center City District CCD and Central Philadelphia Development Corporation CPDC that improve the quality of life and build upon the unique strengths of Center City Philadelphia. About CCDF Our Work News The Next Phase of The Rail Park Termed the Viaduct Greenway this next phase of The Rail Park will convert an abandoned railroad viaduct 6. 8 acres of brownfields from Vine Street to Fairmount Avenue into an elevated park that links diverse neighborhoods together with an active transportation trail.