Travel using your Gold Opal card to Dungog and change there for an XPT and coach to Tweed Heads. Then bus/light rail and train to Brisbane using a QLD Go Card.
Travel by Opal card to Dungog and change there for an XPT to destinations on the North Coast, all for a mere $5.
Sydney to Melbourne
The regular price by train from Sydney to Melbourne is $65. With a couple of changes along the way we've bought the price down to just $26
Day trip from Sydney to Ettalong, Woy Woy, round trip back to Sydney
Starts with a ferry to Manly, bus to Palm beach, ferry to Ettalong, bus to Woy Woy and train back to Central
It costs the same if you're using a Seniors Opal card or just a few dollars on a regular Opal card.