The tram square at Glenhuntly is buggered - which may have been a small factor in doing the grade separation.
From a post on Twitter:
The tram track runs from right to left; the ends of the rails are not supposed to be sticking about 3 to 6 cm in the air.
The railway rails are continuous through the crossing. The tram rails are consequently cut into short sections to fit in the five foot and six foot. This is the westbound tram track and trams cross the railway from right to left. I suspect that the impact of trams (especially their unsprung weight of wheelset and motor) coming off the crossing off the picture to the right has, over time, forced down that end of the short section of rail and this end up. The eastbound track is similar, but not as bad, and a mirror image.
The drops certainly cause trams to bang and bounce their way across the crossing, and it wouldn't take much to cause a derailment.
There is also what looks (and sounds) like a complete vertical crack through one of the rails in the Up (rail) line. If you listen carefully as an Up train goes over the crossing there is an almighty bang as each wheelset goes over a point about a metre before the crossing.
The crossing as a whole is coming up for its 10 year birthday, so it hasn't done badly.