The General Transit Feed Specification (GTFS), also known as GTFS static or static transit to differentiate it from the GTFS realtime extension, defines a common format for public transportation schedules and associated geographic information. GTFS "feeds" let public transit agencies publish their transit data and developers write applications that consume that data in an interoperable way.
How do I start?
Overview of a GTFS feed
A GTFS feed is composed of a series of text files collected in a ZIP file. Each file models a particular aspect of transit information: stops, routes, trips, and other schedule data. The details of each file are defined in the GTFS reference.
An example feed can be found in the GTFS examples. A transit agency can produce a GTFS feed to share their public transit information with developers, who write tools that consume GTFS feeds to incorporate public transit information into their applications. GTFS can be used to power trip planners, time table publishers, and a variety of applications, too diverse to list here, that use public transit information in some way.
Making a Transit feed publicly available
Many applications are compatible with data in the GTFS format. The simplest way to make a feed public is to host it on a web server and publish an announcement that makes it available for use.
A list of transit agencies who provide public feeds is available on the GoogleTransitDataFeed project site.
Submitting a Transit feed to Google
If you're at a public agency that oversees public transportation for your city, you can use the GTFS specification to provide schedules and geographic information to Google Maps and other Google applications that show transit information.
If you provide a transportation service that is open to the public, and operates with fixed schedules and routes, we welcome your participation; it is simple and free.
To participate in discussions around GTFS realtime and suggest changes and additions to the specification, join the GTFS realtime discussion group.
Additional resources are available on the Community page.