All 5 Chemtrans/Incitec/Orica tankers are permanently parked at Kooragang Island and were photoed on 06/03/2012.
In order, the photos are VTGX 007, 008, 009, NTHX 3480, 3481 (Entire Fleet). From the photos, all 5 looks to be of the same origin.
I last saw one of these (VTGX 009) in service on a NRC Steel train in 2001.
Enjoy!