Its sister tunnel - the Semmering Base Tunnel [0] - is scheduled to be completed in 2030. These two combined greatly reduce the travel time from Vienna to Graz and Klagenfurt (combined 1h 15m time saving).
You don't hear that much about great engineering projects today, yet it's still an incredible feat to build those.
You don't hear that much about great engineering projects today, yet it's still an incredible feat to build those.
[0] https://en.wikipedia.org/wiki/Semmering_Base_Tunnel