Regarding NSW and rule NSG608, while trains may run at up to line speed after passing absolute signals at stop under the authority of the network control officer, might I suggest that this is not a good idea if the line speed is high. Restricted speed - i.e. a speed allowing the train to be stopped short of any obstruction within sighting distance - is always a better idea, even if the network control officer (signaller/network controller) has given assurances that the line is clear.
In most cases, signallers will not recommend speeds when using rule NSG608 and it is therefore at the driver's discretion, but any attempt by Operations personnel to minimize delays in the event of signal failures by encouraging more than restricted speed should be disregarded.
The risk is that the network control officer, who may control a large area and be working under the pressure of a heavy workload, may make a mistake or give misleading information that instils the driver with a false sense of security about the condition of the line ahead. It's better to be safe, and perhaps a few minutes late, than sorry, lest we have a repeat of Glenbrook.
Also, in automatic sections, there is some question of whether their indications in signal boxes should be relied upon for safety-critical purposes owing to the potential of the track diagrams to freeze or suffer telemetry failure.
My opinion only.