Damn, I was hoping that no one would guess it straight away haha
Thanks all for the comments, all I really did was look at a image off nearmap, take a few measurements and then "freehand" it.
I did see the URL for the Railcorp complete track curve and gradient plans, including Central, dated November 2011, on this railpage thread http://www.railpage.org/f-t11365537-0-asc-s0.htm Apparently it is 45 MB in size but has pretty colour pictures of the swimming pools and other sport locations. Also schools eg Birrong Boys high, have the pretty picture guides as well for driver familiarization.
Apparently there also is a 638 kb pdf of the metropolitan tracks, including central, on a download site.
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