# description
An identifier that uniquely references a specific vehicle journey in a real-time transit feed.

# properties.tripId.description
GTFS trip_id of the trip being referenced

# properties.startTime.description
Scheduled start time of the trip in HH:MM:SS

# properties.startDate.description
Start date of the trip in YYYYMMDD format

# properties.scheduleRelationship.description
Relationship to the GTFS schedule (SCHEDULED, ADDED, UNSCHEDULED, CANCELED)

# properties.media.description
Media resource URLs (images, audio, video)