header {
  gtfs_realtime_version: "1.0"
  timestamp: 1506482007
}
entity {
  id: "1"
  alert {
    active_period {
      start: 1505880000
      end: 1506484800
    }
    informed_entity {
      stop_id: "29705"
    }
    informed_entity {
      stop_id: "29715"
    }
    header_text {
      translation {
        text: "test service alert"
        language: "en"
      }
    }
    description_text {
      translation {
        text: "This is only a test"
        language: "en"
      }
    }
  }
}