The 4th phase of expansion will be implemented in three stages by the end of 2018. All the stages are being accompanied by an expansion of bus services in the region. This is because the S-Bahn system will only achieve its full potential if buses and trams provide good connections to the stations.
In June 2014, the expansion work was completed on the left shore of Lake Zurich and in the Zimmerberg region. In December 2015, the lines to Knonaueramt, Limmattal, Furttal, Unterland, the right lake shore and Pfäffikon ZH will be upgraded. The third and final stage will be carried out in December 2018. It improves the services on the lines between Zurich and Winterthur and around Winterthur.
Stage 1: mid-June 2014
It will primarily be the passengers on the left shore of Lake Zurich, in the Zug region and Glarnerland who benefit from this.
- Opening of Löwenstrasse station and the Weinberg tunnel
- Quicker connection from the left shore of Lake Zurich to Zürich Nord
- Expansion of Zimmerberg bus operations
- Reduction of the S-Bahn services in Zürich Wipkingen
Stage 2: December 2015
Improvements in the S-Bahn network for the Knonaueramt, Limmattal, Furttal, Zürcher Unterland and Pfäffikon ZH regions and the right shore of Lake Zurich.
- New S-Bahn lines and layout
- S-Bahns every quarter of an hour between Zurich main station and Oberglatt
- S-Bahns every quarter of an hour at rush hour between Zurich main station and Pfäffikon ZH, Stäfa/Meilen, Regensdorf
- S-Bahns every quarter of an hour between Zurich main station and Rafz, Niederwenigen and between the airport and Winterthur
Stage 3: December 2018
Improvements in the Winterthur area. Increases in capacity between Zurich and Winterthur and in Limmattal and Zürcher Unterland.
- S-Bahns every quarter of an hour in between Zurich and Winterthur (via Zürich Stadelhofen)
- Increase in services on regional lines from Winterthur
- S-Bahns every half an hour in the rest of the canton
- 50 new double-decker trains in operation
Many factors influence the realisation of the 4th phase of expansion. These include political decisions at federal and cantonal level and the approval of the necessary financial resources, but also the availability of rolling stock, which is essential for the introduction of the new services. Ultimately, the entire project also depends on the high-speed train connection expansions, cross-city link and the Future Development of Railway Infrastructure (FDRI).