I think IHC markets one in HO but it traded off realism for operation - and it runs by hand. I suppose it would be possible to make one. With DCC technologies you could even operate it 'wireless' Actually this sounds familiar - is one of the brass manufacturers working on something like this?
I think Roco is bringing one out in HO that's intended to be DCC operational. I know it's not out yet, but don't know when they plan on releasing it. They do have a operational cargo crane out which is nice, although expensive.
