Key:trip_ref

Description
Schedule number of a passenger train route. Show/edit corresponding data item.
Used on these elements
should not be used on nodesshould not be used on waysshould not be used on areasmay be used on relations
Useful combination
Status: in usePage for proposal

is used to denote the schedule number(s) of a passenger train route. The majority of uses and the definition come from a mechanical edit documented here: https://community.openstreetmap.org/t/mechanical-edit-proposal-ref-trip-ref-for-certain-passenger-train-routes/98282