i am not sure for others, but in next release i will submit new ALG transporter which is a size of a liner (not so long but higher), new Heavy Miner...also very large transport ship...it will be longer then adv train for sure....
as for smaller transports, there are variety among them but they are not used very much cause of smaller cargo space...that will always be their flaw...
there are trade factions that could get their own trade vessel, but i really doubt that there will be anything larger in cargo then adv train...
and people will try to have largest cargo hold no matter what we put in game or how we reduce their agility and defensive possibilities
