Walking alongside rural railway lines

I lived for 12 years near Perenjori in the Midlands region of WA. WA, as in many other States, has thousands of kilometres of railway line, all with a maintenance track running alongside. I used to regularly go for a walk along one of those access tracks, and even drove on one a few times.
I have been hunting on the Internet to find any statements about the legality of this. The only reference I found:
https://www.artc.com.au/community/tresp ... vandalism/
As I understand it, the railway land in WA is owned by the WA State Government, and in some cases leased to a private company to manage the line. I presume that ARTC is one such company.
All over rural WA there are these access tracks alongside railway lines, and never once have I ever seen a sign saying you shall not enter here, nor have I ever seen a locked barricade.
Is it one of those situations where technically you are not supposed to walk on the access track, but no one cares if you do? Would the police approach you if they saw you walking on a rural railway access road/track?
In rural WA, you could walk between towns along railway maintenance tracks instead of along public roads, which would be far more pleasant.
Curious if anyone has any experience with this, or has a clearer understanding of the legal situation.
EDIT:
This thread has turned out to be very WA-specific, but I did intend to seek input on the situation Australia-wide. Is WA unique in having hundreds of kilometres of closed lines? (see my posts further down).
I have been hunting on the Internet to find any statements about the legality of this. The only reference I found:
https://www.artc.com.au/community/tresp ... vandalism/
As I understand it, the railway land in WA is owned by the WA State Government, and in some cases leased to a private company to manage the line. I presume that ARTC is one such company.
All over rural WA there are these access tracks alongside railway lines, and never once have I ever seen a sign saying you shall not enter here, nor have I ever seen a locked barricade.
Is it one of those situations where technically you are not supposed to walk on the access track, but no one cares if you do? Would the police approach you if they saw you walking on a rural railway access road/track?
In rural WA, you could walk between towns along railway maintenance tracks instead of along public roads, which would be far more pleasant.
Curious if anyone has any experience with this, or has a clearer understanding of the legal situation.
EDIT:
This thread has turned out to be very WA-specific, but I did intend to seek input on the situation Australia-wide. Is WA unique in having hundreds of kilometres of closed lines? (see my posts further down).