Please do not unsubscribe from this conversation. 

If you fail to discuss this all these edits may be reverted. Consider that OSM is nearly 20 years old, and infrastructure like the Channel Tunnel will have received attention over many years to make sure it is compatible with various routing services. It is therefore unlikely that existing tagging was very far wrong. 

I'm concerned that your changes will break numerous downstream applications which rely on OSM data for routing. This is why such changes need to be discussed.

Jerry aka SK53