Recently the government announced that there would be replacing the entire regional rail fleet with new rolling stock, to be delivered from the early 2020s.
This will see all of the existing XPT, Xplorer and Endeavour rolling stock replaced with a a single uniform new model of train. A total of 110 carriages will be ordered which mean it will be a one for one replacement as there are 110 regional carriages currently in service.
It is understood that these new trains will have their main service centre and maintainace hub in Dubbo, whilst maintaing a smaller maintain centre and layover in Sydney. This is part of the government’s plan to increase rural jobs.
Transport NSW Blog 