Cutting it close
Not far from GZ you can see what's left of the old railway line. The tracks are no longer there but you can still see the original cutting, plain as day. If you have come from the south along the straight you will notice the cutting continues into the bush as the main walking track turns right towards GZ. You may also notice through the trees and past the fence the new working trainline and if you're lucky you may even see one go by.
The geocache you seek is a regular size with plenty of room for swaps and TB.
Enjoy and happy caching.
Ubyybj.