I guess when the ATSB report and Rail regulator investigation is complete, we may get to see stunning evidence.The NRSR is the safety regulator for rail in WA.
One thing I need to confirm is the State Regulator (Rail) is doing a separate investigation?
An equivalent arrangement exists with regards to the ATSB, the WA government contributes towards the funding of the ATSB rather than running their own investigation office. NSW and Victoria are the last states to maintain separate investigation offices rather than funding the ATSB - and even these offices now have collaboration agreements with the ATSB.
It is my suggestion that the cab doors have a receptacle for the reverser which unlocks them, then a key is released which must be taken so the door can be opened and the door can be locked on the outside with this. If not, a breach alarm would sound at train control.Removing the reverser from the loco is a protocol which exists for the purpose of preventing unauthorised driving of a loco, not for runaway protection. Requiring it to be left in the loco would make it available in the event of a break-in.
Further to that, any protocol which leaves the driver locked in the cab and unable to escape in an emergency would be strongly resisted by the drivers' unions.
We will see what the investigations determine happened with respect to how the train got moving and why it wasn't stopped. My guess is that improvements to the vigilance control system would achieve the aims you desire more effectively than locking drivers into their cabs.
I have a feeling that in the past 5 years BHP has been taking non-experienced locomotive drivers (for political correctness) and this may be the result. I highly doubt an experienced driver has done this. There is a possibility, but I doubt it.It will be interesting to see what the investigations turn up on this front.
Rail historically has a record of doing a very good job of training new drivers but performing weakly when it comes to maintaining and upgrading competency, leading to a high proportion of incidents in Australia being caused by complacency. I feel that this is primarily an issue of culture within the industry, and that there will be little impetus towards changing it until there is a major incident where numerous lives are lost.