Well there's a CityRail Endeavour here.
Also there's a CountryLink Xplorer on the DLS. The new livery 2006+ is for Trainz 2006+. There's also an original livery for Trainz 2004+
Currently memeboy is working on an XPT.
N3V won’t add these unless these conditions are met:
1. There is a creator willing to make a model for TS3
2. N3V wants to include new models in TS3
3. The creator gives permission to add new models to TS3
4. The model is compatible with TS3.
For all of these conditions to be met is an extremely low probability so don’t get your hopes up.