The line beyond Warrnambool railway station ,the former Port Fairy and Hamilton rail lines are going as far as the Walsh Estate in East Warrnambool where the Westvic is located.Beyond that the line to Dennington (where Fronterra plant is located) the line is closed. There is no existing rail link beyond that to Koroit or anywhere else.
Most industrial estates and possible rail connections will be developed in the easter part of the town as far as I know.
There was a proposal to build an industrial estate with rail sidings near WBC in Allensford.but that failed as geologists found that the area was riddled with underground caves ...
The Westvic site was upgraded recently and should be able to handle current traffic.