Factorio Forums

I was thinking it would be cool to have more train cars e.g a train car that can transport cars or a robo port traincar.

there is nothing stopping you from picking up the car and walking around with it in your pocket (or put it in the train car like any other item)

Good point but that was just an example

You can transport all the items by train and insert them using inserters, except for liquids.

For liquids you can use the Rail Tanker mod: https://forums.factorio.com/forum/vie ... =94&t=6847
It will allow you to fill the cargo wagon with liquids.

Or you can use the Fluid Barrel mod: https://forums.factorio.com/forum/vie ... =94&t=7887
It adds full barrels for all liquids in the game and adds recipes for filling/emptying them.