Board packet · transit data quality · checked 2026-08-01
South Shore Line
Grade B · 89.7 / 100
Unchanged since 2026-07-31.
What this grade measures
The quality of the schedule data this agency publishes for trip-planning apps: whether riders using Google Maps, Apple Maps, or Transit see current, correct, and complete information. It measures the data feed, not service quality or operations.
Progress this period
No newly cleared items this period. The score and trend above reflect where the feed stands today.
What needs attention next
Three improvements, in priority order, each sized so the board can see what it is approving:
Check with your AVL vendor that every vehicle assignment flows into TripUpdates, including school-day and tripper runs.
2 of 2 trips scheduled during the sampling window had no live predictions. Riders on those trips get schedule data dressed up as realtime. Caltrans expects every operating trip in TripUpdates.
Estimated effort: A vendor data-mapping question.
Drop the short name from route_long_name and keep the long name descriptive, like 'Downtown via 5th Ave'.
Some route long names repeat the route's short name inside them. Apps show both names together, so riders see the number twice, like '5 5 Downtown'.
Estimated effort: One field per flagged route.
Review the rule documentation for 'service_extends_far_in_the_future' at https://gtfs-validator.mobilitydata.org/rules.html and check the flagged rows in your feed.
Service extends far in the future (flagged by the MobilityData validator). See the linked rule for what this affects.
Estimated effort: Varies.
Finding handoff
Move one finding to a recheck
Select one finding. Copy the request, make the change in the feed-producing tool, then compare the next complete run.
- Feed evidence
- 2 of 2 trips scheduled during the sampling window had no live predictions.
- Next action
- Check with your AVL vendor that every vehicle assignment flows into TripUpdates, including school-day and tripper runs.
- Recheck
- Publish the changed feed at the same URL. On the next complete, comparable scorecard run, confirm that this finding is no longer reported.
Copy handoff text
- Feed evidence
- Some route long names repeat the route's short name inside them.
- Next action
- Drop the short name from route_long_name and keep the long name descriptive, like 'Downtown via 5th Ave'.
- Recheck
- Publish the changed feed at the same URL. On the next complete, comparable scorecard run, confirm that this finding is no longer reported.
Copy handoff text
- Feed evidence
- Service extends far in the future (flagged by the MobilityData validator).
- Next action
- Review the rule documentation for 'service_extends_far_in_the_future' at https://gtfs-validator.mobilitydata.org/rules.html and check the flagged rows in your feed.
- Recheck
- Publish the changed feed at the same URL. On the next complete, comparable scorecard run, confirm that this finding is no longer reported.
Copy handoff text
Produced by the GTFS Scorecard, an open-source data quality tool. A data-quality read to support the board conversation, not an official compliance determination. Live scorecard: https://gtfsscorecard.org/agency/south-shore-line/. Rubric v1.3, validator 8.0.1.