Yeah, and the last five years has not been drilling, but installing. The last year has been testing and tweaking (accordingt to the ORF article.)
Seems like a great project outcome. Mostly within budget, no political chaos due to delays (AFAICT) and allowing several months for testing before announcing it open.
1998: Start of construction of the Koralm Railway
2008: Start of construction of the Koralm Tunnel
2018: Breakthrough Koralm Tunnel
2020: Final Koralm tunnel breakthrough
2025: This announcement (https://orf.at/stories/3414173/ in German)
https://infrastruktur.oebb.at/en/projects-for-austria/railwa...