At Brisbane King George Square bus station, how do you find out where your bus goes from?

In Brisbane, there's a fairly new bus underground bus stop on the busway tunnel at King George Square. There are only two platforms, one for each direction, but each platform is several hundred meters long. On each platform, there are 6 different stops along it, A-F, and bus routes are assigned to one of these stop doors.

Short of walking the length of the platform until you find a stop that lists your bus number, is there any way to know which stop along the platform a given route uses? Perhaps a central display board somewhere, or some way to check online beforehand? For regular users, they'll know which stop, but for a tourist told a route number and to go to King George Square busway station it's a bit more of a challenge!