SBB awards Contract to buildthe Eppenberg Tunnel

The SBB (Swiss Federal Railways) awarded the main contract section for the four-track upgrading of the Olten–Aarau route in November 2014. The contract worth some 274 million Swiss francs was awarded to the Marti Eppenberg JV. It involves the roughwork for the Eppenberg Tunnel as well as its accesses in the Wöschnau and in Gretzenbach. The SBB embarked on the preliminary work for the tunnel and its access sections in early September 2014. The main operations are scheduled to start in spring 2015 and will last until late 2020. The upgrade to create a four-track route is being accomplished within the scope of the ZEB major rail infrastructure project.

The JV headed by the Marti Tunnelbau AG will excavate the two-track, 3 km long tunnel with a tunnel boring machine. This emerged as the most economic approach. In addition a TBM drive results in fewer emissions for local residents and the environment than by tackling the scheme conventionally via drill+blast. The bids for furnishing the tunnel and the access sections with rail technology (tracks, overhead wire, signals etc.) will be undertaken separately, probably in summer 2017.

Thanks to upgrading the Olten–Aarau line (Eppenberg Tunnel) to produce four tracks the state and the SBB intend removing the Olten–Aarau bottleneck by the end of 2020. By and large the project embraces developing the Olten access, a fourth, 2.6 km long track between Dulliken and Däniken and as the core, the twin-track, 3 km long Eppenberg Tunnel as well as extensive connecting measures. There will also be new tracks laid at Olten Station as part of the scheme. The overall project will cost 855 million Swiss francs.


Related articles:

Issue 02/2018 Switzerland

Eppenberg Tunnel: Successful Breakthrough early February 2018

An important milestone for the continuous four-track east/west axis in Switzerland has been accomplished: The tunnel boring machine has finished the 2600 m long tunnel through the Eppenberg in its...

Issue 06/2016 Switzerland

TBM Assembly at Eppenberg Tunnel: Driving starts in early 2017

The Olten–Aarau route is one of the busiest Swiss rail arteries; between Däniken and Wöschnau it narrows from four tracks to two. This bottleneck is to be eliminated by 2020 so that train services...

Issue 02/2019

Eppenberg Tunnel: Soft Ground Drive and Inner Lining

The railway line between Olten and Aarau is located on the main route between the cities of Berne and Zurich. On account of high demand for both passenger and goods traffic, the SBB is upgrading this...

Issue 05/2014 Switzerland

Swiss Tunnel Congress 2014

The Swiss Tunnelling Society (STS/FGU) of the Swiss Engineers and Architects Association (SIA) staged its conference, the Swiss Tunnel Congress (STC), in Lucerne on June 11 and 12, 2014 with reports...

Issue 08/2017

Eppenberg Tunnel: Convertible TBM for Rock and Soft Soil

The Eppenberg Tunnel with its connections to the existing track system is included in Lot A of the overall project. This project consists of the part-projects TP1 to TP3 and TP8, which are executed...