Optional Email address actively monitored by the agency’s customer service department. This email address should be a direct contact point where transit riders can reach a customer service representative at the agency.

Optional URL of a web page that allows a rider to purchase tickets or other fare instruments for that agency online.

Required Identifies a location: stop/platform, station, entrance/exit, generic node or boarding area (see location_type). ID must be unique across all stops. stop_id, locations.geojson id, and location_groups.location_group_id values. Multiple routes may use the same stop_id.

Optional Primary language used by this transit agency. Should be provided to help GTFS consumers choose capitalization rules and other language-specific settings for the dataset. See ISO 639 for language codes.

Required Full name of the transit agency.

Optional A voice telephone number for the specified agency. This field is a string value that presents the telephone number as typical for the agency's service area.

Required Timezone where the transit agency is located. If multiple agencies are specified in the dataset, each must have the same agency_timezone.

Required URL of the transit agency.