Google Transit Feed Specification

The Google Transit Feed Specification (GTFS) is an open standard format for describing public transportation schedules and associated geography. Google provides map, trip planning and other useful services free of charge to public transportation agencies that submit their service network using GTFS.

GTFS is comprised of a set of text files, structured in CSV format, for transit elements such as routes, stops, calendars, schedules and so on. The image below diagrams the GTFS data model.