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Corrado,

Try 'Google metro' or whatever Google is calling the public transportation 
data they've posted (for quite a few cities now).  I've used some of this 
a bit for a project with a current student, but there are piles of data 
there that seem to be underexplored.


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Mason

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  Mason A. Porter
  University Lecturer (and Tutorial Fellow, Somerville College)
  Oxford Centre for Industrial and Applied Mathematics
  Mathematical Institute, University of Oxford

  Homepage: http://www.maths.ox.ac.uk/~porterm, IM: tepid451
  Blog: http://masonporter.blogspot.com/
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  "That's my new excuse, and I'm sticking to it." (Me)
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