Forrest WA TransPacific Rail Line

Have seen a number of question regarding traveling this line. Can we or cant we?
A friend who has been living on the Nullarbor for 2 1/2 years says, SA/WA border to Kalgoorlie there are no restrictions (other than when the road is closed because of rain). Tarcoola - SA/WA border, there are no signs, no one has ever been fined before, and there is no one to stop you and people do it all the time. Be sensible though make sure you are well equipped and don't go hailing down a train unless you have a life threatening emergency (it costs a lot of money to stop a train, the downtime costs $$$$$). Also, it is best not to drive on the ballast track as this is where you may pick up a spike in your tyres and things do fall off trains, there are other tracks away from the track. And make sure you stop at Forrest, the only place from Tarcoola - Kalgoorlie where you can get fuel (Diesel, ULP) Camping with power, good water, fire pits wood supplied, B&B Accom, and meals and great outback hospitality. They also have a museum, historic trail and a huge sealed runway, you may even see a plane come in there. (Cook is a closed railway town even though the caretakers Jan & Ivor will help wherever possible).
Happy Traveling