"I spent 10 weeks last Summer as an intern on the strategy team of Transport for London's (TfL) London Rail division.... My general task was to help London Rail start to make use of the oceans of data spewing out of the Oyster smartcard ticketing system, but I spent the bulk of my time working on a project that came to be titled Oyster-Based Performance Metrics for the London Overground. I've posted my final report and slides and outline for the presentation I gave to TfL executive management." Some interesting data and information here.