To those who mentioned Chicago and Atlanta having lines branching out, yes, but this is the normal pattern, for lines to branch out as trains leave the central business district. Denver and Philly are unusual in that they have a spur branching out on a line heading TOWARD the CBD. A good example of commuter rail doing this is the LIRR where most trains west of Jamaica go to New York Penn in the Midtown mega-CBD but some trains go to Flatbush Avenue to serve Downtown Manhattan and Downtown Brooklyn.
I have tried to Google, without success, photos and info of the Vine (Chinatown) station as it appeared more than 40 years ago. I can tell from old maps that, yes, Ridge Avenue came all the way down to Race Street and today's Headhouse is located in what was the middle of the street. Before the commuter tunnel and Vine Street Expressway construction, this area must have looked totally different. Today it's just a parking lot but what existed here before? Homes? Factories?