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Full design and consulting services for the high capacity twin-track railway line between Vienna and St. Pölten.

The new Vienna-St. Pölten railway line with new alignment over a length of about 49 km for mixed traffic is an essential component of four tracking the existing Westbahn line.

The new Vienna-St. Pölten railway line branches off from the existing Westbahn line in Hadersdorf/Weidlingau, runs underneath the Wienerwald in a 13.2-km-long tunnel, subsequently passes through the southern Tullnerfeld and the Perschling valley to St. Pölten and joins the existing Westbahn line at the junction in Wagram.

The new railway line will be linked to the existing Tulln ? St. Pölten railway line at the projected new regional train station at Tullnerfeld; furthermore the St. Pölten freight rail bypass will be linked to the new line at the junction in Wagram.

The new railway line is designed for a speed of 200 km/h, with maximum longitudinal gradients of 8? and tunnels comprising some 41 % of the route length. The longest tunnel of the mined tunnels (20 km) is the Wienerwald tunnel (l = 13.2 km). Furthermore, approx. 4.5 km of underground line sections are to be constructed.

The new alignment of the railway line requires extensive adaptations of the existing road network, with a road parallel to the railway line to be constructed in the Tullnerfeld over a length of approx. 13 km. For crossing existing roads and rivers numerous over- and underpasses shall be constructed.

ILF provided engineering services for the multi-stage design process, comprising studies on alternative alignments and alignment selection (time frame 1990- 1995), design for environmental impact assessment (time frame 1995-1998), permit application design in compliance with railway law (time frame 1999-2002), tender and detailed design, (period since 2001) project management services, coordination and support of public relations work, railway engineering design and tunnel design of line sections and preparation of a tunnel safety concept.