Every public transit company offers a network map of its transit network.
The user should have the choice to select stations from such a station network map.
I imagine that the program has a (possibly online) list of pdfs(or any image file, jpg, png, etc). If the user selects to use a station network plan,
his current GPS position aids to select the correct plan. Then if the user taps on a certain point on the map the system checks whether or not he tapped on an area that represents a station and the corresponding address is loaded. To achieve this we need a set of shapes(probably rectangles) associated with each pdf which provide a mapping between pdf coordinates and the station(address, gps coordinates, name).
The difficult thing is to create this set for every pdf in an efficient manner.
I believe it would be reasonable to program a tool for that purpose that can display pdfs. If the developer then selects a rectangular area with his mouse the tool prompts the developer to input the station associated with this area. This way it should be relatively easy to add individual network maps.
Here is a list of network maps to start with: http://metropoliphone.com
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