curl --request GET \
  --url 'https://api.511.org/transit/timetable?api_key='

{
  "Siri": {
    "ServiceDelivery": {
      "DataObjectDelivery": {
        "dataObjects": {
          "TimetableFrame": {
            "id": "TF:SF",
            "vehicleJourneys": {
              "ServiceJourney": [
                {
                  "id": "SF:49:weekday:0001",
                  "DayTypeRef": "weekday",
                  "passingTimes": {
                    "TimetabledPassingTime": [
                      {
                        "StopPointInJourneyPatternRef": "18079",
                        "ArrivalTime": "06:05:00",
                        "DepartureTime": "06:05:00"
                      }
                    ]
                  }
                }
              ]
            }
          }
        }
      }
    }
  }
}