OpenTripPlanner already exists: http://www.opentripplanner.org http://www.opentripplanner.org I've only played around with it but it seems very capable. It al

OpenTripPlanner already exists: http://www.opentripplanner.org http://www.opentripplanner.org I've only played around with it but it seems very capable. It also has a pretty cool analysis tool that lets you see the changes in transit accessibility when a bus/train is removed, etc.