The Milan S Lines is a commuter rail system serving the metropolitan area of Milan, Italy.
The system comprises 12 lines serving 124 stations, for a total length of 403 km and is fully integrated with the Milan Metro. There are 732 rides per day[citation needed] with a daily ridership of about 230,000.[1] The network works like a rapid transit system when entering the city center through the Milan Passante, where more lines share the same tracks, considerably decreasing headways. Lines also share tracks in other sections, outside of the Milan Passante and outside of the city of Milan, too, like between Milano Bovisa and Saronno, Milano Forlanini and Pioltello-Limito or Milano Certosa and Rho.