I suggest you travel by air. Reasons are below:
train service in Australia is very expensive, around double than air ticket
bus jounery are too long, e.g. Sydney to Cold Coast will cost you 12 hours, but the cost will be same as air ticket
There is 3 budget airline in Australia, their competition is fierce, so the cost is low and they operate many flights. You can find the suitable flights easily.
If you really want to travel by bus, you can visit
www.greyhound.com.au. You can have some idea on it
2007-03-25 23:17:45 補充:
開頭又話 bus, 之後就 train?? 即係點.. 火車仲貴呀.