u/AuroraAustralis27

On some sections of the SE light rail particularly around Moore park I think. There are busses that run on the tram tracks, does anyone know where exactly this happens and also I was wondering the signalling for trans is through conduction from the metal wheels on the rails but how do the signals account for busses

I was on Platform 2 at Bondi Junction and noticed some little white boxes next to the tracks with an arm sticking up. Does anyone know what these are? My initial thought was smth for ETCS