man i really love the road train... the only reason that they use raod train in australia is coz its road are usually empty, long, and straight that the reason that they use these truck as they dont have to turn it much around corners and tranporting goods becomes more faster and easier then trains.....
According to my knowledge there are only 2 road train which are the longest amongst all the rest they are under the athority of a construction company is guess but not sure....but believe me it has 18 trailer compartment behind it i will try to post its pic if i find one...