The General Transit Feed Specification (GTFS) defines an open standard data format for public transport schedules. Unlike other public transport data standards, it emerged to meet specific practical needs in passenger information systems and is a relatively simple tabular format. GTFS first appeared in 2005 through cooperation between a public agency and a private company, as a way for Portland, Oregon's TriMet agency to provide schedule data for the then-experimental Google Transit routing service. The standard is now maintained and revised through a public process on the gtfs-changes mailing list. For more information on the origins of GTFS, see chapter 10 of Beyond Transparency.
Publicly available feeds are cataloged and archived at GTFS Data Exchange, and Google also maintains a list of public feeds.
At gtfs.org, we host a machine-readable catalog of feeds that helps avoid name clashes in areas where several agencies provide open data.
If your identifiers used within your GTFS feed are persistent, we will host an RDF version of your feed on this subdomain. Interested? Contact Pieter Colpaert.