This was the third planned (test) X'Trapolis to Flemington Racecourse. I took photos of one there in 2002.
The set (yesterday's run) was the modified X'Trapolis set. 893M-1647T-894M-956M-1678T-955M.
There are some minor signalling works that would need to happen at Flemington Racecourse if they wanted the line signed off for X'Trapolis running.