I like the idea in principle, however, lifting a train in its entirety goes rather against the grain.
I'd rather see something like a container lift that is either attached to the input/output ports on the normal freight station, or acts itself as a freight station. The whole thing would then transport the freight container either up or down depending on the selected direction. Once the "full" container has been taken to the other side *and emptied* then it would be returned to the initial side ready to be filled again.
The container lift station would be placed just like the existing freight station, but would have no external inputs or outputs.
I don't really see the need for Mk.1/2/3 etc. variants.