Engineering office for the planning, design and realisation of railway electrification systems in Switzerland

Wiederkehr & Villiger AG

Riedstrasse 1, CH-6343 RotkreuzNew on Amplifa

2015Founded

22Employees

Rotkreuz (CH)Location

AGLegal form

About us

Wiederkehr & Villiger AG (Wi&Vi) is an engineering office based in Rotkreuz (Zug) specialising in railway electrification. Founded in 2015, the company plans and realises overhead contact line and catenary systems, traction power supplies, switchgear and switching stations, service and depot facilities as well as return conductor systems and railway earthing. Its services include planning and design, approval procedures, construction and execution projects, site supervision and commissioning, as well as mast and cross-span calculations, overhead contact line control systems, safety-relevant key interlocking systems and multi-voltage AC/DC systems. For asset surveying, the contact wire position is recorded with a laser measuring device. Clients include SBB (framework agreement via IG Contact – rs ingénieurs SA + Wi&Vi AG), SOB and the Federal Office of Transport (BAV). The office was involved, among other things, in commissioning surveys of the Gotthard and Ceneri Base Tunnels as well as in major projects such as the capacity expansion of Bern West station and the Zurich–Winterthur Four-Track project (Mehr-Spur). In 2025 the company employs 22 staff.

Site: Rotkreuz
Processes: Planning, design, approval procedures, construction projects, execution projects, site supervision, Contact wire position survey with laser measuring device, Planning and design of railway electrification, Approval procedures, Construction and execution projects, Site supervision and commissioning, Overhead contact line and catenary, Mast and cross-span calculations
Materials: Overhead contact line and catenary, Traction power supply, Switchgear and switching stations, Return conductor system and railway earthing, Multi-voltage AC/DC systems, Contact wire position survey
Certificates: Laser measurement of contact wire position
Founded: 2015
Employees: 22
Industries: Railway electrification, Railway infrastructure, Traction power supply

01
Planning and design
02
Approval procedures
03
Construction and execution projects
04
Site supervision
05
Commissioning

Services and Competencies

FLO

Overhead contact line and catenary

Planning and design of overhead contact line and catenary systems including mast and cross-span calculations.

BSV

Traction power supply

Design of traction power supply systems for railway infrastructure.

Switchgear and switching stations

Planning of switchgear, switching stations and overhead contact line control systems.

Return conductor system and railway earthing

Design of return conductor systems and railway earthing for electrical safety.

MSA

Multi-voltage AC/DC systems

Multi-voltage AC/DC systems with feed-in to the overhead contact line.

Contact wire position survey

Recording of the contact wire position with a laser measuring device for asset surveying.

Location

Rotkreuz

Headquarters / Office

Projects and Systems

**Gotthard Base Tunnel – commissioning survey incl. access lines**Railway electrification · Railway infrastructure

**Capacity expansion Bern West station**Overhead contact line · Railway infrastructure

**SOB Service Centre Samstagern**Service and depot facilities · Railway infrastructure

Inside the production

New office premises Riedstrasse 1, Rotkreuz (2020)

IG Contact – cooperation with rs ingénieurs SA

Industries

Railway electrificationRailway infrastructureTraction power supply

Processes & technical limits

Processes	Tolerance	Max. part	Weight	Lot size	Materials
Planning, design, approval procedures, construction projects, execution projects, site supervisionEngineering	–	–	–	–	–
Contact wire position survey with laser measuring deviceTesting	–	–	–	–	–

Additional services

Planning and design of railway electrificationApproval proceduresConstruction and execution projectsSite supervision and commissioningOverhead contact line and catenaryMast and cross-span calculationsTraction power supplyService and depot facilitiesReturn conductor system, railway earthingSwitchgear and switching stationsContact wire position survey with laser measuring deviceOverhead contact line control systemsSafety-relevant key interlocking systemsMulti-voltage AC/DC systems

Reference customers

SBB (framework agreement via IG Contact - rs ingénieurs SA + Wi&Vi AG)SOB (Service Centre Samstagern project)BAV (plan approval dossiers MSZW and Bern West)

Quality and Measurement Technology

The contact wire position is recorded with a laser measuring device; the projects are submitted as part of the approval procedures with the Federal Office of Transport (BAV).

Evidence	Rotkreuz
Laser measurement of contact wire position

History

2015
Founding of Wiederkehr & Villiger AG on 23.09.2015 by Roger Wiederkehr, Herbert Villiger, Sandra Wiederkehr, Markus Greminger, Bruno Willimann and Patrick Fuchs
2016
Commissioning survey of the Gotthard Base Tunnel incl. access lines
2018
Team grows to 12 employees; start of the major project 'Capacity expansion Bern West station'
2019
Team grows to 14 employees
2020
Move into new office premises at Riedstrasse 1, Rotkreuz; start of the major project 'Four-Track Zurich–Winterthur' (MSZW); commissioning survey of the Ceneri Base Tunnel
2021
Framework agreement with SBB via IG Contact – rs ingénieurs SA + Wi&Vi AG
2022
Team grows to 19 employees; project start for the SOB Service Centre Samstagern
2023
Expansion of the management board and succession arrangements; 20 employees; submission of the plan approval dossier to BAV for MSZW and Bern West
2024
Herbert Villiger leaves the management board; Patrick Lustenberger becomes new substitute member
2025
10 years of Wi&Vi; 22 employees