Metropolitan regional express services
Originally introduced as “metropolitan RERs”, these services are officially known as metropolitan regional express services (SERM). Their main aim is to increase train frequency on existing lines converging toward major metropolitan areas. By offering more low-carbon mobility options in regions currently plagued by road congestion, SERM meets the needs of urban populations while cutting CO₂ emissions from transport.
What SERM will change?
In practical terms, SERM will mean more trains each day, higher frequency during peak hours, more regular timetables, longer operating hours and frequent stops in densely populated areas. In short, everything needed to make rail the preferred mode of transport!