| Line 3 | |
| Type: | Commuter rail |
| Status: | Operational |
| Locale: | Metropolitan City of Turin |
| First: | 9 December 2012 |
| Operator: | Trenitalia |
| Stops: | 19 |
| End: | & |
| Stock: | MDVC, MDVE, Vivalto |
| Owners: | Turin Metropolitan Railway Service |
Line SFM3 is part of the Turin Metropolitan Railway Service. It links Turin to Bardonecchia and Susa.
The line was opened on 9 December 2012.[1] Service was extended into France at Gare de Modane on 10 September 2017, and was offered on Sundays and public holidays.[2] The extension has been discontinued in early 2020.