for c'town, there are 2 buses you can use to get to mac station form c'town station.
the uws shuttle, which is on the other side of the platoform when you stop off at c'town station and then the cityrail buses that go to mac station. to use the cityrail one, all you need is a valid ticket that goes to mac staion and you can go on.
i would rather the city rail becasue its bigger and when you stop at the station, its there waiting for you. the uws chuttle is a smaller bus, liek them toyota shuttle buses [not the Hiace]