Line S5 (Milan suburban railway service)

Line S5 is a commuter rail line serving the city of Milan, Italy and its surrounding metropolitan area. It is part of the Trenord network and is designated as a "Servizio Ferroviario Suburbano" (Suburban Railway Service). The line connects Varese to Treviglio, traversing through the Milan city center via the Passante ferroviario, an underground railway tunnel.

The S5 line operates at regular intervals, typically every half-hour during peak hours and hourly during off-peak hours. It provides important connections to other suburban lines, regional lines, and the Milan Metro network at various interchange stations along its route.

The route is significant for connecting key municipalities within the Milan metropolitan area, facilitating daily commutes for workers and students. The Passante ferroviario section allows for efficient north-south travel through the city without relying on surface transportation.

Operation of the line is managed by Trenord, which is a joint venture between Trenitalia and FNM (Ferrovie Nord Milano). The S5 line is integrated into the STIBM ticketing system, allowing passengers to use integrated tickets and travel cards for travel within the Milan metropolitan area.

The S5 line plays a crucial role in the overall public transportation infrastructure of Milan, contributing to reduced road congestion and promoting sustainable mobility.