Z scale is as stated 1:220.The track code usually used is code 55 though there are those that hand lay code 40.For more information check the very good Z forum on Trainboard,there is also Z Central at http://zcentralstation.com/ which IMHO is the place to get Z info.
Z gauge is a 1/220 scale, the gauge being 6.5 mm (standard gauge). I don´t now what code is applicable, maybe code 35? There are not that many makers of Z gauge track, the leading one certainly being Marklin. Do a Google search on "Z gauge" to find resources!
Someone please tell me...
What scale/ratio is Z gauge and what track gauge is it please?
What rail size does it use?
Thanks