[drewda]

Many public transit agencies provide both static and real-time data.

- static data often is sharing using the "GTFS" specification, which includes stop locations, route geometries, scheduled trips, etc. See http://gtfs.org/

- real-time data is shared using a variety of specifications, and typically includes vehicle locations, service alerts, and other notifications from the agency

The static kind of data can certainly be cached for local use. Try browsing and downloading some from the Transitland open transit data platform and its API: https://transit.land