Doncaster is already established area, so laying a rail line means destorying homes costing $1 million each. And Doncaster does have 'Park and Ride' which has plenty of direct public transport to city.
And what public transport does Tarneit and Wyndham have? And whats stopping the govt to lay a rail line in open lands.
Re Doncaster: Not true - there is no need to acquire lots of houses because the Eastern Freeway already has a train-line space built-in (as they anticipated a future train line).
Re Tarneit etc: I agree that a train line is urgently needed. But State Governments are the most horrible managers of money. I can guarantee you won't see anything of substance for the next 10 years, esp with Baillieu's mandate to cut costs