/sydneytrains GTFS for Realtime has overlapping calendar.txt entries making it impossible
to display timetables correctly.
Also, erratic routes appear in routes.txt, such as Out of Service or Revenue route entries and duplicate routes with different route_ids:
T2 City Circle to Leppington via Bankstown
CCN Central to Newcastle via Strathfield
NRW Sydney (Central) to Armidale