Freightgate, my thought process is that, having received and read back a train order, driver could control both the switches and the crossing with two simple radio activities.
Technically possible (as with aviation PAL).
Does it happen this way? Don’t know, hence the enquiry about someone from Tasmania with knowledge rather than (my) speculation.
Certainly Tasmania does seem to have moved towards greater use of radio technology (as reported in relation to the cement train incident some months ago) for shunting etc.