GTFS-realtime for CTA Train Tracker
created at Dec. 18, 2013, 3:02 a.m.
GTFS-realtime for SEPTA TrainView and TransitView APIs.
created at May 17, 2014, 11:02 p.m.
GTFS-realtime StopTimeUpdate, VehiclePosition, and Alert feeds for WMATA
created at Nov. 17, 2012, 9:32 p.m.