The Milan S Lines is a commuter rail system serving the metropolitan area of Milan, Italy. The system comprises 11 lines serving 123 stations, for a total length of 403 km and is fully integrated with the Milan Metro. There are 415 rides per day with a daily ridership of about 230,000. 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.