From the platform ends - it's built into the side of a hill and there aren't really any good viewing points outside the station. The main bridge is glass-sided, and normally busy (it's a cut-through from the city centre to the area behind the station - so not really practical for taking photos). If you go out the back, over the tramlines and up the hill you can get a view looking down on the station, but you won't get any detail of trains from up there.