header {
  gtfs_realtime_version: "1.0"
  incrementality: FULL_DATASET
  timestamp: 1522940273
}
entity {
  id: "999"
  vehicle {
    trip {
      trip_id: "2342188"
      start_time: "15:05:00"
      start_date: "20180403"
      schedule_relationship: SCHEDULED
      route_id: "901"
    }
    position {
      latitude: 37.364323
      longitude: -121.91148
      bearing: 329.0
      speed: 0.0
    }
    timestamp: 1522793100
    vehicle {
      id: "999"
    }
  }
}