I think he or she means the 'Next Generation Rollingstock' EMU sets built by Bombardier which are the latest suburban trains used in Brisbane. From what I understand they are not available in Trainz, although I recall someone was working on a QR 160/260 class SMU/IMU set for Trainz (similar to the Transperth B series and Adelaide Metro 4000 class EMUs) a few years ago but I heard nothing more about it so I presume it was abandoned.
Either way, from what I'm aware those trains are not available in Trainz. As Pware mentioned register your copy of Trainz above at the top of the page under 'Register' to freely acess the DLS which will provide you with other QR trains that are available.