There was also supposed to be a modification to the CTC interlockings in NSW to allow simultaenous entry to loops , which is what VIC,SA and WA CTC already allows.
Note that simultaneous arrival at CTC crossing loops in WA was supposed to have been disconnected as recommended by the coroner after the Hines Hill head on collision.
To restore simultaneous arrivals, one would have to do one or more of the following:
* provide safety margin (overlap) between starting signal and fouling point.
* provide catch points, such as between Junee and Albury.
* provide ATP (Automatic Train Protection) of some kind.
Yes but why.
There arnt any catchpoints in VIC or SA (I dont know about WA.) or any kinds of ATP.
Apart from Hines Hill where the accident would still have happened even without simultaenous crossings (it would have been a head on.)
Im unaware of a single incident where an accident has happened on CTC territory due to simultaenous crossings being allowed.
Junee-Albury is the only section in Australia to have loop catchpoints at every crossing loops (plus Willow Tree, Kankool, and a few odd loops on steep grades on the North Coast line).
The catch points provide a safety margin if the train entering the loop and the driver miscalculates, particularly if the train length is almost as long as the loop lengths.
Other states probably don't bother with catchpoints because
* traffic desity is less.
* loops are straight and level, and visibility is good.
At Hines Hill the suggestion is that the driver (and possibly the boy with him) miscalculated the distance to the starting signal at red thus causing the collision.
At Hines Hill, it is not known if the driver had suffered a Violet Town-like heart attack and had gone through several signals.
At Hines Hill, if there had been no simultaneous arrival, the driver with the boy would have had to have gone through two red signals, not likely unless he/they were asleep or had suffered heart attacks.
A half decent ATP system would have prevented the Hines Hill collision.
Catchpoints on the main line as well as the loop would have prevented the Hines Hill collision, at the cost of a derailment, and an unpredicatable amount of collision.
Surely a half decent ATP system would be better than catchpoints, since you would avoid a derailment caused by the catchpoints.
At Hines Hill, the loop was only slightly longer than one of the trains, illustrating the point that loops should if possible be a few hundred metres longer than any train.