A lot of people have hit the nail on why rail is used far less for interstate transport; cost, time , storage are the main problems.
Cost may be changed over time as fuel prices rise but looking to u.k/e.u where they pay 50%+ per litre and have similar trucking issues , that will be a long way off unless legislated.
Time could be saved on the east coast by killing 4birds with one stone. A dedicated high speed passenger tgv/maglev Brisbane , Sydney Melbourne allowing dedicated rail for freight. Go look how close tnts main depot is to rail(cosgrove rd Enfield) this would not only speed up freight(bird1) it would reduce the need for a second airport in Sydney (bird2) reduce fuel burnt by both trucks and planes(bird3) and be far safer in the case of an accident, be it by bad loadin/overloading driver or equipment failure(bird4).
If you solve the time issue you solve the storage problem for the companies using just in time.
As to double handling, the same thing happens now with parcel freight companies, load into small pud in city , transfer to b-double to send to next state, unload to either a pud for capital delivery or onto another semi for regional distribution centre then into a pud.(pud= pick up delivery anything from a 1t van to 20ton rigid)
One other thing is that truckies are their own worst enemy now with a large number of owner drivers meaning they cannot afford to protest or strike as they risk losing their contracts and going bust. This has muted the voices that would have been raised about unrealistic schedules.

