@timrichards - from the Coomera station (north Gold Coast), it is 15 minutes, or better (there are a few extra trains here and there): towards Brisbane from 6am to 8am, and towards Gold Coast from about 4:30pm to 8pm. The timetable is designed for people going to Brisbane in the morning and coming back in the afternoon. Going in the other direction, or outside the peak = 30 minute frequency.