GTFS-Realtime
The live half of GTFS — where the vehicle actually is, rather than where the timetable says it should be. The entries here are the ones that closed the gap between a published schedule and a moving bus.
How this list is decided. Membership is not a field an editor set: it is every published entry whose own text names GTFS-Realtime, matched at build time, with the sentence printed under each row so you can judge the match yourself. 12 entries in 12 cities. For what the term means rather than who uses it, see GTFS (General Transit Feed Specification) in the glossary.
✔ Every published entry is checked against the public sources it cites before publication.
Where it appears in the atlas
Auckland Transport publishes its timetables as a downloadable GTFS file and its vehicle positions, trip updates and service alerts as a GTFS Realtime feed open to any developer who registers for free.
Riders now meet the predictions largely inside other people's apps: the agency publishes Bus Tracker, Train Tracker, alert and GTFS-Realtime feeds, each behind a free registered key.
The NTA publishes its timetables as GTFS under a CC BY 4.0 licence, and since August 2020 the live predictions as a GTFS-Realtime feed that needs a registered key; the 2023 upgrade added Luas and Iarnród Éireann services and live bus positions.
Every bus now reports its position through a public GTFS-realtime feed powering the RideMETRO app and SMS next-bus lookup.
Those buses report their position by GPS into a public GTFS-Realtime feed, and a control centre opened in the Escandon district in 2023 monitors the network as cameras are fitted to buses and stations.
Static GTFS is a public download, while GTFS-realtime for buses, Metrorail and Metromover is served through Swiftly and requires requesting access — the real-time layer is published but gated.
The metropolis explicitly tells reusers to prefer SIRI over GTFS-RT, because SIRI carries more of the disruption model.
Delhi's transport department has published its bus network as open data since November 2018 — GTFS timetables, stop coordinates and route maps, plus a GTFS-Realtime feed of vehicle positions refreshed every ten seconds; the government called it the first such portal in India.
The oldest datasets were created in April 2014 and the newest in June 2023; the live transit feeds have since moved to the national access point transport.data.gouv.fr, where the Métropole has published GTFS, NeTEx, SIRI and real-time GTFS-RT vehicle positions since June 2025.
Roma Servizi per la Mobilità, the mobility agency of Roma Capitale, runs the "Muoversi a Roma" traffic-and-transit information portal and app (launched 2014) and publishes the city's public-transport data as open GTFS and GTFS-realtime feeds.
Carries GTFS, GTFS-Realtime (Trip Updates, Vehicle Positions, Service Alerts) and SIRI/NeTEx APIs, lists SFMTA among operators, requires a registered API token, defaults to '60 requests per 3600 seconds', and applies its own data agreement on top of any operator terms.
Transport for NSW's Open Data Hub has published live GTFS-realtime feeds — vehicle positions, trip updates and alerts — for Sydney's trains, buses, ferries and light rail since 2016, with feeds refreshing about every 15 seconds under a CC BY 4.0 licence.
Others in this group
The whole layer
Every standard, protocol and licence the atlas names, with the open-data licence ladder in one table: Standards & licences.