TODS-W315
A run event works a trip end to end (trip_id set, the matching mid_trip flag not 1), but its start_location is not the trip's first stop, or its end_location is not the trip's last stop, in the supplemented stop_times.txt.
Interpretation: the spec says these locations 'should' be the trip endpoints, so a mismatch is a warning; skipped for mid-trip events and for trips with no stop_times.
Spec reference: https://tods-transit.org/spec/#run_eventstxt