header {
  gtfs_realtime_version: "2.0"
  timestamp: 1611384222
}
entity {
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  vehicle {
    trip {
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      start_date: "20210123"
      route_id: "9418"
    }
    position {
      latitude: 43.08104
      longitude: -89.42821
    }
    timestamp: 1611384192
    vehicle {
      id: "2539"
      label: "154"
    }
    9: 2
    10: 40
  }
}