Originally Posted by
drewguy
That "stub end" is intended to go to the new D concourse. Though it might be possible to use the same bore/track for an APM to the international arrivals building. Thought it's a long haul from the C end of the concourse to the D end - meaning either plan international arrivals for that end or also build the planned loop that would connect the APM from the C end to the D end for international arrivals.
MUC and some other airports manage international pax by way of different platforms/doors/trains to physcially separate flows of passengers using the same tracks. Something like that would be much more practical and cost-effective than new bores for distinct train lines.