Wildpark-Höfli Double Track: Construction Work

The increase in traffic volume on the Sihltal Railway has been accommodated in recent years through measures relating to rolling stock and operations, such as increased service frequency and increased train capacity. However, the introduction of a 10-minute service interval has resulted in very limited time reserves at the crossing points, meaning that delays are frequently transferred to trains travelling in the opposite direction.

The anticipated further increase in passenger numbers can no longer be accommodated by the existing infrastructure. The service planning resulting from an overall assessment and coordinated with the ZVV requires further infrastructure expansion, taking into account the requirements of the Swiss Disability Equality Act (BehiG).

The project area extends from km 8.8 to km 10.2. A double-track section is planned between km 9.0 and km 10.2, which also requires the existing Wildpark-Höfli stop to be reconstructed.

The works in the track area and the railway-related civil engineering structures will be carried out during a six-month total closure of the railway line.

The scope of the civil engineering contractor's works includes the following:

• Construction of a new double-track section, including sub-ballasting (track superstructure by third parties)
• Construction of the track substructure, drainage systems, foundations for overhead line and signalling systems, and cable ducts
• Construction of two side platforms at Wildpark-Höfli stop, including ramps, fences, railings and similar elements, as well as platform canopies (platform furniture by third parties)
• Construction of the foundation for a railway technology building
• Replacement construction of the Zelgweg pedestrian underpass at km 9.395
• Extension of the pedestrian underpass in the Breitwiesenweg area at km 10.047
• Construction of a new retaining wall at the sports field and the adjacent properties, approximately from km 9.78 to km 10.06
• Replacement construction of two noise barriers (320 m and 110 m in length)
• Realignment of the cantonal road Sihltalstrasse, including road drainage and public lighting
• Further adaptation and reinstatement works
• Relocation of utility lines, in particular the DN600 spring water pipeline of the City of Zurich and the water supply pipeline of the Municipality of Langnau am Albis (installation of the water pipeline and associated installations by third parties)
• Temporary traffic light system and temporary replacement bus stops during the railway closure

The following elements are not included in the scope of the tender:

• Renewal of the track superstructure, including replacement of the cable duct between Sihlau and Wildpark-Höfli (km 8.4–8.8); carried out concurrently during the total railway closure
• Railway technology building (supply and construction by third parties)
• Railway signalling system, including the signalling system for the Sonvico level crossing
• Modification of the traffic light system at the Sonvico level crossing on Sihltalstrasse
• Overhead line system
• Cable systems
• Point heating system
• Telecommunications systems
• Control and automation systems
• Electrical works
• Furniture and equipment elements at Wildpark-Höfli stop
• Road markings / passenger guidance markings
• Safety services
• Surveying services for the client
• Sanitary works