The "breadcrumbs" element is always present, on top of the page.
It shows you where you are on the lab.
It enables you to reach any page on the lab.
A trip pattern groups every trip running the same NMBS/SNCB shadow line number with the same headsign. Aribus inbound rules select on these patterns rather than on the gtfs routeId.
gtfsNmbsTripPatterns.id is built as gtp$<gtfsNmbsTrainNumbers.id>$<headsign> — so it carries the schedule, train type, line number and train-number range inside the id.
Type + line + headsign is not unique: the same label exists across several schedules and train-number ranges. Use the full id to tell them apart.
The trip <-> pattern join table. One row per gtfs trip.