It would be great to see Transperth provide real-time data for bus, train and ferry services in GTFS-realtime or SIRI format.
This information is currently available within their app and to some extent on their web site.
Similar datasets have been available in all other Australian states through Open Data programs for over a decade now.
The use case would be for third party transport apps and platforms like Google Maps and Apple Maps to incorporate accurate arrival forecasts, live vehicle tracking and disruption messaging into their products. This would improve public transport customer satisfaction and access for customers with accessibility needs.