I was looking for something else and came across this, which is meant for the use of those who want to access QR’s rail network.
It is quite detailed in the information given and doesn’t just cover Brisbane, but most of the Qld network.
Of course, I found the electrification details interesting, but there is a lot of other interesting stuff in it for rail gunzels.

https://www.queenslandrail.com.au/business/acccess/Documents/Brisbane%20Metropolitan%20System%20Information%20Pack%20-%20Issue%203%20-%20October%202016.pdf


Cheers,
Mick in rather hot Brisbane