The cross-over point: an essential element in the BBT project
There are more works here than just tunnels for train traffic, or the service tunnel running beneath them. In the complex tunnel system of the BBT, the cross-over point is a key element for the operational flexibility of the future railway line. Work is currently underway here on the final lining. Join us for a talk with Michael Knapp, project manager of the H53 Pfons-Brenner construction lot.
Michael, what is the cross-over point?
It is a strategic infrastructure designed to ensure maximum flexibility and safety for the future railway line; it serves as a connection between the two main tunnels of the tunnel. Its primary function is to allow trains to change tracks, ensuring operational continuity in the event of maintenance or operational requirements.
What works make up the cross-over point?
The cross-over point consists of two interconnecting tunnels, with a total of four switches. Each interconnecting tunnel is 584 m long from one switch tongue to the other, the curve radius is 1,200 m and the slope is 6.7‰, the same as in the main tunnels. The maximum speed allowed for trains travelling through the cross-over point is 100 km/h.
In which construction lot did the work take place?
The cross-over point was excavated as part of the H52 Hochstegen construction lot, which was completed in December 2023. Lot H53 Pfons-Brenner, on the other hand, includes works to complete the final lining of the two connecting tunnels located near St. Jodok, not far from one of the three emergency stops along the BBT route.
What other works are under way in this construction lot?
In addition to the final lining of the cross-over point, excavation of the main tunnels continues both northwards, with the TBMs known as Wilma and Olga, and southwards, using drilling and blasting. Furthermore, at the end of January, one of the four towers used for storing excavated spoil in the Padaster valley was dismantled. This is an important step in terms of construction site logistics, because it is another sign that excavation works are drawing to a close. In terms of the entire BBT project, well over 90% of excavation work has been completed.
So why is the cross-over point so important?
This part of the tunnel system has a dual purpose: it conforms to the most modern standards in railway tunnels and it provides the Brenner Base Tunnel with operational flexibility in the face of any challenges that might occur. The presence of the cross-over point is further proof that the BBT is an infrastructure that has been planned in such a way as to maximise the efficiency of cross-border transport.
