Summary of ODS 2.0 changes

[safrazier17]

Updated July 1, 2024

This issue contains only the two pull requests which were determined to be appropriate for inclusion in TODS 2.0. Other issues will be moved into a new summary issue for tracking the next quarterly round of spec updates.

File	Proposal (Issue No.)
deadheads.txt	Deprecate and replace with trips_supplement.txt (#55)
ops_locations.txt	Deprecate and replace with stops_supplement.txt (#55)
deadhead_times.txt	Deprecate and replace with stop_times_supplement.txt (#55)
runs_pieces.txt	Deprecate and with key information moving to run_events.txt (#60)
run_events.txt	Proposals in #60: Add service_id to allow for service-unique run composition. Add run_id as there will no longer be runs_pieces.txt from which to retrieve run_id. Change piece_id from Required to Optional. Add block_id to allow simple definition of links between runs and blocks; currently, making this connection requires going through a trip_id. Add job_type field to allow for attaching multiple personnel responsibilities to a single run_id. Convert event_type field from enum to text. Deprecate event_name field. Adds trip_id field to allow for describing the trips that compose a run. Rename event_from_location_id to start_location and change it from Optional to Required. Deprecate event_from_location_type field. Rename event_time to start_time. Add start_mid_route field. Deprecate event_to_location_type field. Rename event_to_location_id to end_location and change it from Optional to Required. Rename event_duration field end_time and convert from Non-negative Integer to Time. Add end_mid_route field.

Major Breaking Changes

There are two primary changes under discussion. As of February 13, 2024 they are largely contained in two main proposals:

• 55

  • Restructures ODS to remove GTFS-analogous files (deadheads.txt, ops_locations.txt, and deadhead_times.txt) and replace them with GTFS-supplementing files (trips_supplement.txt, stops_supplement.txt, and stop_times_supplement.txt)

• 60

  • Changes representation of runs, pieces, events and the relationships between 1) runs and trips and 2) runs and blocks
  • Provides for the ability to schedule multiple employees on a single run
  • Provides for the ability to have service-unique runs

Superseded and deprecated issues

• Proposed: support multiple jobs per trip/event #54. This proposal has been moved into #60.
• Proposed: add runs.txt to explicitly define runs #51. This proposal has been moved into #60.
• Proposed: Remove run_events.event_duration #48. This proposal has been moved into #60.
• Proposed: Rename run_events.event_time to run_events.start_time #48. This proposal has been moved into #60.
• Proposed: Add run_events.end_time #48. This proposal has been moved into #60.
• Proposed: Add deadheads.run_id and deadheads.piece_id #52. This proposal has been eliminated by #55.
• Proposed: Add run_events.service_id and run_events.run_id #52. This proposal has been moved into #60.
• Proposed: runs_pieces.start_type allows for a piece to begin with an event, but there is no defined way to identify the event with which a piece begins. This proposal has been eliminated by #60.
• Proposed: runs_pieces.end_type allows for a piece to end with an event, but there is no defined way to identify the event with which a piece ends. This proposal has been eliminated by #60.
• Proposed: deadheads.to_trip_id and deadheads.to_deadhead_id should be conditionally prohibited upon the condition that only a maximum of one of the fields can be non-null for any given entry #13. This proposal has been eliminated by #55.
• Proposed: deadheads.from_trip_id and deadheads.from_deadhead_id should be conditionally prohibited upon the condition that only a maximum of one of the fields can be non-null for any given entry #13. This proposal has been eliminated by #55.
• Proposed: deadheads.txt does not allow for a run to consist of a single deadhead #13. This proposal has been eliminated by #55.
• Proposed: support service-unique run_ids #51. This proposal has been eliminated by #60.
• Proposed: add block_group_id #52. This proposal has been eliminated by #60.
• Proposed: add ops_location_type to ops_locations.txt #34. This proposal has been eliminated by #55.
• Proposed: add persistent ids #44. This proposal has been eliminated by #55.

[safrazier17]

Updated with all currently active issues. I am in the process of working out where the various proposals may be in conflict / need to be made consistent