Found this old photo of the track and an article on the tops theme park at myer if anyone is interested in taking a look but sadly can't find information past its closure.
http://www.couriermail.com.au/news/queensland/brisbanes-favourite-play-spaces-remembered/news-story/c3d67787674ead0fc6bbf686c94ec3ab
Also an article on Dazzaland theme park in the adelaide myer centre which unfortunately closed too if anyone is curious to read about this.
http://www.adelaidenow.com.au/messenger/city/my-life-as-the-king-of-dazzeland/news-story/3eeaf787a2376012722048c69a9ab5f1