The NSW Ministry of Transport is developing an official application for iPhones and other mobiles that will allow public transport users to plan trips and track their ferries, buses and trains in real-time.

The app will be developed as part of an overhaul of the Government's 131500.com.au transport information service. The project was put out to tender this year and the department intends to roll out the new services, and the mobile app, from next year.

In the interim, a Transport spokeswoman said the department was working with independent application developers to give them easy access to bus, train and ferry timetable information "later this year".