I looked into the gtfs (gtfs.org) a while ago. This is a data feed format (protobuf based) that a lot of sites like this use for both schedules and real time updates that is pretty widely adopted. Most gtfs location feeds require getting an API key. But there are a handful of public ones that share actual location updates without that.
This is also how e.g. Google maps and others integrate schedule information for public transport as well.
Building a map from the real time updates is relatively straight foward once you have access.
This is also how e.g. Google maps and others integrate schedule information for public transport as well.
Building a map from the real time updates is relatively straight foward once you have access.