When you say the ICE trains are not certified for the tunnel – exactly what do the authorising authority look for in terms of build quality.
I presume that the ICE trains currently do go through the mountain tunnels and whilst not underneath water, is still below ground and for considerable distances.
Has the certification process actually started or is this another example of European Transport infrastructure not communicating?? Will brand new trains be required or can the existing ICE be modified, if indeed anything needs to be done to them…??