Lausanne–Renens: engineering work on the flyover.

The flyover between Prilly-Malley and Renens is one of our most impressive structures. 

It combines durability and functionality, integrating seamlessly into the urban environment. Its purpose is simple: to allow trains to pass over other railway tracks without crossing conflicts with other trains.

All about the project

We would like to warn you, as a resident affected by this construction work, about occasional disruptions by giving you regular updates. You can read our calendar and our news updates to find out about upcoming work. 


  • 2017 – planning permission
  • November 2018 – start of construction work
  • Summer 2022 – completion of the work
  • December 2022 – Start of operations

Engineering work updates.

We are currently carrying out the following work:


Between Renens station and the stop at Prilly-Malley in the middle of the railway area


We are currently building the flyover in three successive stages of work. The first thousand metres of viaduct were constructed in 14 months for the first stage and completed in March 2020.

From mid-September 2020, work will be devoted to the removal of 800 metres of protective wall and the construction of new tracks under and next to the structure. The final stage in the construction of the viaduct (175 metres) will then be able to start in June 2021. 

The work will be periodically carried out in the day and/or night in 2020 to 2022. We will inform you of noise in advance by means of a letter in the post.


Mid-September 2020 to summer 2022.