I tried walking the old Kew line some time ago when I was working in the area myself - it's hard to find where it initially branches off behind Glenferrie Oval but then it's easy to pick it up again through Hawthorn and Kew where it eventually forms the VicRoads carpark and office building.
Apparently that will all be demolished in the next few years as they move the entire bureaucracy to Ballarat and the State government sells up to build more luxury apartments on the site. There's a chronic shortage of luxury apartments in that area, don't you know!
Do you prefer the seedy motel they also built on the site of the Kew line?
As long as they don't demolish any heritage buildings or overshadow backyards, let them put up flats on any industrial or office site they like. It reduces the speed of Melbourne's outward sprawl and if the the land is owned by the Crown, then the government gets a bit more cash to spend on hospitals, police, schools, debt reduction and other worthy stuff.