Originally published at:
GTFS Realtime (GTFS RT) is an extension to GTFS Static and enhances the static transit information with real-time information. GTFS real-time data is reconciled with GTFS static data. The real-time feed includes all known changes in public transport in Switzerland in the overall preview window (three hours) for all transport undertakings which deliver real-time data.…

We’ve tested the GTFS-RT source and it seems to cover way fewer departures than the VDV source. For example real-time departures for ZVV in Zurich are only included in the VDV source, but not in GTFS-RT. Is there an overview which connections are known to be missing from GTFS-RT?