Cargo containers

No, nothing wrong with this, u're on the way to go...(i mean nothing bad in checking new things ;))

The transport and trains can only dock on planet with mooring fixtures (then quickdock) and statrions
with so called large mooring fixtures, like Fort Bush.

Their worth : BIG cargohold for the "right" trading item, class 10 turrets (when u know where to get this toys )
and with that and other upgrades : kind a "cheap capital"

Have a look at the WIKI - LEXICON. And then you might have to explore . There's also help in single player, if you are up to that.
Good luck pilot.

large transport : NO containers, "only" normal trading goods
(alien artifacts, cardamine, rum, whiskey (the good, not the often seen player char ;-D )
and ofc the "black market goods" to name a few)

Quote from Mak

Can the large transport pick up containers at all?
or is it limited to some other type of trading?

Containers are meant for cosmetic purpose-only, that's all...back in days i was disappointed too!

I have a Train an therefore can tell you from expirence that yes you can buy containers. Not only can you buy them, you can trade them at other stations.
Containers can only be bought at House Home Worlds, i.e. Planet New York, Planet New Tokyo and even Planet Malta.
The trick is to buy low then sell high at a different Capitol Home World.
Also, Containers act as extra armour when you find yourself in the wrong place at the wrong time. When your shields go down you will start to loose some before you are destroyed.
If you want to be a sucessful trader, try to be "friendly" with as many factions as possiable.

And this is not the purpose of the forum. Imagine, if u offer every possible answer here, there is a chance u will destroy every fun and in-game online communication, which is not idea B-) Right?