The S1 was activated on 12 December 2004, and operated initially between Saronno and Milano Porta Vittoria.[4]
With the change of timetable on 15 June 2008, the service was extended from Milano Porta Vittoria to Milano Rogoredo, where there is an interchange with regional trains and long-distance services to and from Genoa, Bologna and Mantua.[5]
To coincide with another timetable change on 13 December 2009, the service was further extended, from Rogoredo to Lodi, during the day in off-peak hours. From 13 June 2010, all other Monday to Friday services were extended to Lodi.[6]
At June 2023, all trains run from Saronno to Lodi up to 9.30 p.m; after that and until the end of service, trains are limited to Lodi-Milano Bovisa, where it is possible to cover the remaining part of the route thanks to an interchange with line S3.[1]
Stations
The stations on the S1 are as follows (stations with blue background are in the municipality of Milan):[7]
As of 2024, S1 trains ran half-hourly up to 9.30 p.m. from Saronno to Lodi, while running only from Lodi to Milano Bovisa (where an interchenge with line S3 allows to continue the journey to Saronno) till the end of the service .
^"S come Suburbano" [S for Suburban]. Direzione Generale Infrastrutture e Mobilità website (in Italian). RegioneLombardia. Archived from the original on 19 December 2012. Retrieved 19 November 2012.
^"Linee" [Lines]. Direzione Generale Infrastrutture e Mobilità website (in Italian). RegioneLombardia. Retrieved 19 November 2012.[permanent dead link]
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