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Use (CSV) GTFS
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‎gtfs-realtime/spec/en/reference.md‎

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## _message_ Stop
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Represent a new Stop added to the feed dynamically. All fields are as described in the GTFS-Static specification. Location type of the new stop is assumed to be `0` (routable stop).
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Represent a new Stop added to the feed dynamically. All fields are as described in the (CSV) GTFS specification. Location type of the new stop is assumed to be `0` (routable stop).
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**Fields**
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| _**Field Name**_ | _**Type**_ | _**Required**_ | _**Cardinality**_ | _**Description**_ |
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|------------------|------------|----------------|-------------------|-------------------|
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| **stop_id** | [string](https://protobuf.dev/programming-guides/proto2/#scalar) | Required | One | Identifier of the shape. Must be different than any `stop_id` defined in the GTFS-Static. |
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| **stop_code** | [TranslatedString](#message-translatedstring) | Required | One | See definition of [stops.stop_code](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in GTFS-Static. |
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| **stop_name** | [TranslatedString](#message-translatedstring) | Optional | One | See definition of [stops.stop_name](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in GTFS-Static. |
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| **tts_stop_name** | [TranslatedString](#message-translatedstring) | Optional | One | See definition of [stops.tts_stop_name](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in GTFS-Static. |
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| **stop_desc** | [TranslatedString](#message-translatedstring) | Optional | One | See definition of [stops.stop_desc](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in GTFS-Static. |
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| **stop_lat** | [float](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Optional | One | See definition of [stops.stop_lat](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in GTFS-Static. |
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| **stop_lon** | [float](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Optional | One | See definition of [stops.stop_lon](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in GTFS-Static. |
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| **zone_id** | [string](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Optional | One | See definition of [stops.zone_id](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in GTFS-Static. |
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| **stop_url** | [TranslatedString](#message-translatedstring) | Optional | One | See definition of [stops.stop_url](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in GTFS-Static. |
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| **parent_station** | [string](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Optional | One | See definition of [stops.parent_station](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in GTFS-Static. |
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| **stop_timezone** | [string](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Optional | One | See definition of [stops.stop_timezone](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in GTFS-Static. |
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| **wheelchair_boarding** | [WheelchairBoarding](#enum-wheelchairboarding) | Optional | One | See definition of [stops.wheelchair_boarding](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in GTFS-Static. |
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| **level_id** | [string](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Optional | One | See definition of [stops.level_id](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in GTFS-Static. |
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| **platform_code** | [TranslatedString](#message-translatedstring) | Optional | One | See definition of [stops.platform_code](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in GTFS-Static. |
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| **stop_id** | [string](https://protobuf.dev/programming-guides/proto2/#scalar) | Required | One | Identifier of the shape. Must be different than any `stop_id` defined in the (CSV) GTFS. |
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| **stop_code** | [TranslatedString](#message-translatedstring) | Required | One | See definition of [stops.stop_code](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in (CSV) GTFS. |
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| **stop_name** | [TranslatedString](#message-translatedstring) | Optional | One | See definition of [stops.stop_name](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in (CSV) GTFS. |
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| **tts_stop_name** | [TranslatedString](#message-translatedstring) | Optional | One | See definition of [stops.tts_stop_name](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in (CSV) GTFS. |
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| **stop_desc** | [TranslatedString](#message-translatedstring) | Optional | One | See definition of [stops.stop_desc](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in (CSV) GTFS. |
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| **stop_lat** | [float](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Optional | One | See definition of [stops.stop_lat](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in (CSV) GTFS. |
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| **stop_lon** | [float](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Optional | One | See definition of [stops.stop_lon](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in (CSV) GTFS. |
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| **zone_id** | [string](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Optional | One | See definition of [stops.zone_id](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in (CSV) GTFS. |
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| **stop_url** | [TranslatedString](#message-translatedstring) | Optional | One | See definition of [stops.stop_url](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in (CSV) GTFS. |
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| **parent_station** | [string](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Optional | One | See definition of [stops.parent_station](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in (CSV) GTFS. |
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| **stop_timezone** | [string](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Optional | One | See definition of [stops.stop_timezone](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in (CSV) GTFS. |
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| **wheelchair_boarding** | [WheelchairBoarding](#enum-wheelchairboarding) | Optional | One | See definition of [stops.wheelchair_boarding](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in (CSV) GTFS. |
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| **level_id** | [string](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Optional | One | See definition of [stops.level_id](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in (CSV) GTFS. |
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| **platform_code** | [TranslatedString](#message-translatedstring) | Optional | One | See definition of [stops.platform_code](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stopstxt) in (CSV) GTFS. |
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## _enum_ WheelchairBoarding
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## _message_ TripModifications
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A `TripModifications` message identifies a list of similar `trip_ids` from the GTFS-Static sharing the same stop pattern, which are all affected by a particular modification, like a detour. The modification is in effect on all of the listed service_dates, until it is removed from the feed. On any given service date, a trip MUST NOT be assigned to more than one `TripModifications` object.
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A `TripModifications` message identifies a list of similar `trip_ids` from the (CSV) GTFS sharing the same stop pattern, which are all affected by a particular modification, like a detour. The modification is in effect on all of the listed service_dates, until it is removed from the feed. On any given service date, a trip MUST NOT be assigned to more than one `TripModifications` object.
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There MAY be multiple `TripModifications` for a given stop pattern. It may be desirable to split the trips into multiple modifications e.g. if the `propagated_modification_delay` changes significantly, over the course of the detour.
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| _**Field Name**_ | _**Type**_ | _**Required**_ | _**Cardinality**_ | _**Description**_ |
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|------------------|------------|----------------|-------------------|-------------------|
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| **modifications_id** | [string](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Required | One | An arbitrary string to identify this detour. The `modifications_id` MUST be unique for all currently active detours. The ID of each replacement trip is generated by concatenating `modifications_id` + ‘_’ + `trip_id`. |
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| **trip_ids** | [string](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Required | Many | A list of trips_ids from the GTFS-Static affected by this detour. All trips linked by those trip_ids MUST have the same stop pattern. Two trips have the same stop pattern, if they visit the same stops in the same order, and have identical stop sequences. If the value `start_times` is set, a maximum of one trip_id can be listed. |
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| **trip_ids** | [string](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Required | Many | A list of trips_ids from the (CSV) GTFS affected by this detour. All trips linked by those trip_ids MUST have the same stop pattern. Two trips have the same stop pattern, if they visit the same stops in the same order, and have identical stop sequences. If the value `start_times` is set, a maximum of one trip_id can be listed. |
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| **start_times** | [string](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Optional | Many | A list of start times in the real-time trip descriptor for the trip_id defined in trip_ids. Useful to target multiple departures of a trip_id in a frequency-based trip. |
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| **service_dates** | [string](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Required | Many | Dates on which the detour occurs, in the YYYYMMDD format. A trip_id will only be modified if it runs on a given service date; the trip IS NOT required to run on all of the service dates. Producers SHOULD only transmit detours occurring within the next week. |
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| **shape_id** | [string](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Optional | One | The ID of the new shape for the modified trips. May refer to a new shape added using a GTFS-RT Shape message, or to an existing shape defined in the GTFS-Static feed’s shapes.txt. |
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| **shape_id** | [string](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Optional | One | The ID of the new shape for the modified trips. May refer to a new shape added using a GTFS-RT Shape message, or to an existing shape defined in the (CSV) GTFS feed’s shapes.txt. |
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| **modifications** | [string](#message-modification) | Required | Many | A list of modifications to apply to the affected trips. |
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## _message_ Modification
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| _**Field Name**_ | _**Type**_ | _**Required**_ | _**Cardinality**_ | _**Description**_ |
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|------------------|------------|----------------|-------------------|-------------------|
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| **start_stop_sequence** | [uint32](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Required | One | The stop sequence value from the GTFS-Static of the first stop of the original trip that is to be affected by this modification. |
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| **start_stop_sequence** | [uint32](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Required | One | The stop sequence value from the (CSV) GTFS of the first stop of the original trip that is to be affected by this modification. |
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| **num_stops_replaced** | [uint32](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Required | One | The number of stops which are canceled and replaced by the `new_stops`. May be zero to indicate no skipped stops. |
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| **propagated_modification_delay** | [int32](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Optional | One | The number of seconds of delay to add to all departure and arrival times following the end of this modification. Can be a positive or negative number. If multiple modifications apply to the same trip, the delays accumulate as the trip advances. <br/><br/>If the value is not supplied, consumers MAY interpolate or infer the `propagated_modification_delay` based on other data. |
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| **new_stops** | [ReplacementStop](#message-replacementstop) | Optional | Many | A list of replacement stops, replacing those of the original trip. The length of the new stop times may be less, the same, or greater than the number of replaced stop times. |
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Each `ReplacementStop` message acts as a template for generating a new stop time in each modified trip. The generated stop time will have the specified `stop_id`.
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The `arrival_time` is calculated from a reference stop in the original trip, plus the offset in `travel_time_to_stop`. The `departure_time` always equals the `arrival_time`.
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The optional fields of [`stop_times.txt`](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stop_timestxt) in the GTFS-Static specification are all set to their default values.
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The optional fields of [`stop_times.txt`](https://github.com/google/transit/blob/master/gtfs/spec/en/reference.md#stop_timestxt) in the (CSV) GTFS specification are all set to their default values.
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![](images/first_stop_reference.png)
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_If a modification affects the first stop of the trip, that stop also serves as the reference stop of the modification._
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| _**Field Name**_ | _**Type**_ | _**Required**_ | _**Cardinality**_ | _**Description**_ |
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| **stop_id** | [string](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Required | One | The replacement stop ID which will now be visited by the trip. May refer to a new stop added using a GTFS-RT `Stop` message, or to an existing stop defined in the GTFS-Static feed’s `stops.txt`. The stop MUST have `location_type=0` (routable stops). |
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| **stop_id** | [string](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Required | One | The replacement stop ID which will now be visited by the trip. May refer to a new stop added using a GTFS-RT `Stop` message, or to an existing stop defined in the (CSV) GTFS feed’s `stops.txt`. The stop MUST have `location_type=0` (routable stops). |
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| **travel_time_to_stop** | [int32](https://developers.google.com/protocol-buffers/docs/proto#scalar) | Optional | One | The difference in seconds between the arrival time at this stop and the arrival time at the reference stop. The reference stop is the stop prior to `start_stop_sequence`. If the modification begins at the first stop of the trip, then the first stop of the trip is the reference stop. <br/><br/>This value MUST be monotonically increasing and may only be a negative number if the first stop of the original trip is the reference stop. <br/><br/>If the value is not supplied, consumers MAY interpolate or infer the `travel_time_to_stop` based on other data. |

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