Springfield

I saw some, I think, at the Springfield Hobby Show, so they're out there.  If I can recall where I saw them, I'll post that.

Wheels of Time Piggy Packer, and transfer crane

Wheels of Time (http://www.wheelsotime.com/) has a Piggy Packer, for moving containers around on the ground, loading and unloading--haven't found the big transfer system yet.  Edit: Walthers offers a crane for transfering from truck to rail and vice-versa.  http://www.walthers.com/exec/productinfo/933-3222

Scratchbuild one

Here's a guy that scratch built one in N scale. 

http://www.nscale.net/forums/showthread.php?12088-First-real-scratchbuilding-project-Container-Crane/page2

Ya I know you don't have the time.

Bernd

A Smaller Port

A smaller port might not have a dedicated container crane. It might use an older and more generic cargo crane something like this.

Either way, just google "n scale cargo crane"  and search the images and you will find what you are looking for.

George

Possum : that generic cargo

Yup!

Some use a special attachment (as seen here) at the end of the hoist, others use a bridle which attaches to the four lift points on the top of the container. 

Just about any crane can be used to unload containers, it is just that the dedicated container cranes are faster and more efficient.

George

i found other picture where

i found other picture where the crane you first posted where used to unload a container ship, it give me something that i can model.

thanks...if at anytime any of the larger crane are available let me know....