It never ceased to amaze me that when an incident occurred such as this or someone was hit by a Train, the Guard was 'grilled' more extensively than the driver.
On paper at least, the Guard is the employee in charge of the Train (NSW) and not the driver yet most events were at the front of the Train in many cases out of the sight of the Guard, not the rear where he was.
I remember a Guard of an Interurban heading to Sydney one day when it hit a 'Jumper' at a station out near St Mary's/Blacktown and he told he had just come from the Inquiry and he had spent quite some time being questioned where as the Driver barely gave his name, employee number etc and was gone.
The Guard was asked what speed the Train was doing, as if he would know as he has no speedo to read along with some questions which inferred he was at fault and wasnt doing his job.
From memory there was almost no forward view along the train of those first single decker Interurbans unless you opened either the door or window.
Just before the ultimate removal of the Brake Vans off Freight Trains in NSW, there were experiments carried out to improve the forward view, such as a raised 'hatch' area fitted with mirrors so the Guard could see forward from his seat at the desk because Trains were growing longer and longer.
I only ever traveled a few times in a Brake Van and sat trying to look along the Train which between Penrith and Bathurst was a waste of time as you could rarely see more than a quarter of the Train for most of the journey.
Prior to this happening at Violet Town, I would be very surprised if any Diesel Loco's in NSW were fitted with any sort of Vigilance control.
The only such control as I remember was the "Dead Man' handle fitted to electric Suburban and Interurban passenger trains.