GTFS Scorecard: Duluth Transit feed quality changes Grade moves, expiry warnings, and score swings for Duluth Transit's GTFS feed. tag:gtfsscorecard.org,2026:agency/duluth-transit/changes 2026-07-06T00:00:00Z GTFS Scorecard GTFS Scorecard Duluth Transit: Grade went D to F. tag:gtfsscorecard.org,2026:agency/duluth-transit/2026-07-06/grade_change 2026-07-06T00:00:00Z Grade went D to F.