Revision history

February 23, 2023

• Added a new page about the Differences between the GTFS Realtime and Google Transit implementation.

February 22, 2023

• Added the Glossary of Google Realtime Transit terminology page to the GTFS Realtime reference section.

March 12, 2020

• Updated the TripDescriptor description on the GTFS Realtime reference page.

February 26, 2015

• Added experimental field direction_id to TripDescriptor (discussion)

January 30, 2015

• Added Protocol Buffer extension namespace to all remaining GTFS-realtime messages that didn't already have one (such as FeedMessage and FeedEntity).

January 28, 2015

• Added experimental field delay to TripUpdate (discussion)

January 16, 2015

• Update description of TripDescriptor.start_time.

January 8, 2015

• Defined experimental enum OccupancyStatus
• Added experimental field occupancy_status to VehiclePosition (discussion)

May 22, 2014

• Updated description of ScheduleRelationship enum in StopTimeUpdate message. (discussion)
• Removed REPLACEMENT from ScheduleRelationship enum values in TripDescriptor message. (discussion)

Oct 12, 2012

• Added timestamp field to TripUpdate message.

May 30, 2012

• Added specific details about Extensions to the specification.

November 30, 2011

• Added Protocol Buffer extension namespace to key GTFS-realtime messages to facilitate writing extensions to the spec.

October 25, 2011

• Updated documentation to clarify that alert header_text and description_text are both plain-text values.

August 20, 2011

• Updated documentation to clarify semantics of the TimeRange message.

August 22, 2011

• Initial version.