# Milan Metro Line 4

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Metro line in Milan, Italy

M4 San Babila station Overview Status Operational Locale Milan, Italy Connecting lines Stations 21 Website Official website Service Type Rapid transit System Milan Metro Operator Azienda Trasporti Milanesi Rolling stock Hitachi Rail Italy Driverless Metro Daily ridership 40,000 (July 2023-February 2024)[1] History Opened 26 November 2022; 3 years ago (26 November 2022) Last extension 12 October 2024 Technical Line length 15.2 km (9.4 mi) Track gauge 1,435 mm (4 ft 8+1⁄2 in) standard gauge Electrification Third rail, 750 V DC Route map

**Line 4** is an underground [rapid transit](/source/Rapid_transit) line in [Milan](/source/Milan), [Italy](/source/Italy), part of the [Milan Metro](/source/Milan_Metro). The line is 15.2 km (9.4 mi) long with 21 stations.[2]

The line was opened in stages between 2022 and 2024.[3][4] It features [automatic driverless trains](/source/Automatic_train_operation)[5] and is designed for a capacity of 24–28,000 passengers per hour in each direction.[6] The expected annual ridership is 87 million.

## Construction

The first three stations of the line (Linate-Repetti-Forlanini) was originally planned to be completed in 2015, as part of the works for the [Milan Expo](/source/Expo_2015). However, delays in planning, financing[7] and construction works forced to postpone the opening, with the first section opening on 26 November 2022[3][8] and the rest of the line expected to open by 2023.[9] The line is 15 km (9.3 mi) long with 21 stations, with its final 13 stops opening on 12 October 2024.[10]

The consortium [ATM](/source/Azienda_Trasporti_Milanesi)-[Webuild](/source/Webuild) is responsible for the construction works.[11][12]

Of the total estimated cost of about €1.7 billion, the [Government of Italy](/source/Government_of_Italy) will cover €786 million via a grant, the municipal [government of Milan](/source/Government_of_Milan) will cover €400 million, and €512 million will be funded by private investors.[11]

## Route

[Tunnel boring machines](/source/Tunnel_boring_machine) used in the project, 2014

Forlanini FS station under construction in 2016

The line connects the south-western neighborhood of *Lorenteggio* with [Linate Airport](/source/Linate_Airport) on the east, passing through the city center. All stations are underground.

Station Name Transfer Opening San Cristoforo FS 12 October 2024[10] Segneri Gelsomini Frattini Tolstoj Bolivar California Coni Zugna Sant'Ambrogio De Amicis Vetra Santa Sofia Sforza-Policlinico [a] San Babila 4 July 2023 Tricolore Dateo 26 November 2022[3] Susa Argonne Stazione Forlanini Repetti Linate Aeroporto Notes ^ Out-of-system interchange at Missori

## Rolling stock

The line uses [Hitachi Rail Italy Driverless Metro](/source/Hitachi_Rail_Italy_Driverless_Metro) [automatic driverless trains](/source/Automatic_train_operation).[5] The line will be operated by 37 four-car EMUs manufactured by [Hitachi Rail Italy](/source/Hitachi_Rail_Italy) at [Reggio Calabria](/source/Reggio_Calabria). Because of production problems caused by the [COVID-19 pandemic](/source/COVID-19_pandemic), some were sent to [Hitachi Newton Aycliffe](/source/Hitachi_Newton_Aycliffe) in England for final fitting out.[13]

## See also

Wikimedia Commons has media related to [Line M4 (Milan metro)](https://commons.wikimedia.org/wiki/Category:Line_M4_(Milan_metro)).

- [Transport in Milan](/source/Transport_in_Milan)

- [Milan S Lines](/source/Milan_S_Lines)

## References

1. **[^](#cite_ref-1)** ["Milan: from Monday extended hours on the M4 metro line"](https://www.agenzianova.com/en/news/Milan-extended-hours-on-the-M4-metro-line-from-Monday/). *Agenzia Nova*. 14 February 2024. Retrieved 25 April 2024.

1. **[^](#cite_ref-metropolitanamilanese_2-0)** ["Linea 4"](https://web.archive.org/web/20130615164227/http://www.metropolitanamilanese.it/pub/page/it/MM/metropolitane_milano?contentId=924). *www.metropolitanamilanese.it*. Metropolitana Milanese. Archived from [the original](http://www.metropolitanamilanese.it/pub/page/it/MM/metropolitane_milano?contentId=924) on 15 June 2013. Retrieved 22 July 2015.

1. ^ [***a***](#cite_ref-MT_3-0) [***b***](#cite_ref-MT_3-1) [***c***](#cite_ref-MT_3-2) ["Apre la nuova metro di Milano: c'è la data per l'inaugurazione della M4, la linea blu"](https://www.milanotoday.it/attualita/metro-4-blu-quando-apre-data-ufficiale.html). *MilanoToday* (in Italian). 21 October 2022. Retrieved 21 October 2022.

1. **[^](#cite_ref-ilgiorno2023_4-0)** ["M4, apre la nuova tratta San Babila-Linate: oggi si viaggia gratis. Tutto quello che c'è da sapere"](https://www.ilgiorno.it/milano/cronaca/metropolitana-m4-nuova-gratis-festa-fermate-glf2313b). *Il Giorno* (in Italian). 3 July 2023. Retrieved 4 July 2023.

1. ^ [***a***](#cite_ref-cronacamilano_5-0) [***b***](#cite_ref-cronacamilano_5-1) ["Metropolitana M4 approvata, realizzazione Linate – Lorenteggio al via"](http://www.cronacamilano.it/cronaca/3268-metropolitana-m4-approvata-realizzazione-linate-lorenteggio-al-via.html). Cronaca Milano. 22 November 2010. Retrieved 26 September 2011.

1. **[^](#cite_ref-MM1_6-0)** ["Milano M4"](https://web.archive.org/web/20171223043347/http://87.248.52.211/pub/page/it/MM/metropolitane_milano?contentId=924). Metropolitana Milanese. Archived from [the original](http://87.248.52.211/pub/page/it/MM/metropolitane_milano?contentId=924) on 23 December 2017. Retrieved 28 December 2011.

1. **[^](#cite_ref-7)** ["Tabacci: a rischio il secondo lotto della M4"](http://milano.corriere.it/milano/notizie/cronaca/11_luglio_29/tabacci-m4-rischio-finanziamenti-expo-1901201418693.shtml). Corriere della Sera Milano. Retrieved 26 September 2011.

1. **[^](#cite_ref-8)** ["Metrò 4, aprono i cantieri"](http://milano.corriere.it/milano/notizie/cronaca/11_maggio_10/metropolitana-4-linea-blu-aprono-cantieri-190606819302.shtml). Corriere della Sera Milano. Retrieved 26 September 2011.

1. **[^](#cite_ref-:1_9-0)** ["L'apertura della linea M4 a Milano slitta per ritrovamenti archeologici (e covid)"](https://www.milanotoday.it/attualita/metro-m4-ritardi-apertura.html). *MilanoToday* (in Italian). Retrieved 21 May 2021.

1. ^ [***a***](#cite_ref-phase3open2024_10-0) [***b***](#cite_ref-phase3open2024_10-1) ["C'è una data per l'apertura di tutta la linea M4"](https://www.milanotoday.it/attualita/m4-data-inaugurazione.html). *MilanoToday* (in Italian). Retrieved 25 September 2024.

1. ^ [***a***](#cite_ref-lavori_11-0) [***b***](#cite_ref-lavori_11-1) ["M4, lavori assegnati a Impregilo e Atm"](http://milano.corriere.it/milano/notizie/cronaca/11_maggio_27/metropolitana-quattro-190741492144.shtml). Corriere della Sera Milano. Retrieved 26 September 2011.

1. **[^](#cite_ref-jan12_12-0)** ["Tar: "Metrò 4, gare regolari". Via ai cantieri"](http://milano.corriere.it/milano/notizie/cronaca/12_gennaio_21/metro-quattro-gare-regolari-cantieri-al-via-santucci-stella-1902954594007.shtml). *Corriere della Sera*. 21 January 2012. Retrieved 22 January 2012.

1. **[^](#cite_ref-14)** Milan Metro cars in Newton Aycliffe *[The Railway Magazine](/source/The_Railway_Magazine)* issue 1436 November 2020 page 9

v t e Urban rail transport in Milan Milan Metro List of Milan Metro stations Rolling stock Meneghino Leonardo [it] Suburban railway List of Milan S Lines stations Milan Passante railway Rolling stock TAF TSR Caravaggio Besanino [it] Azienda Trasporti Milanesi Trenord Railway stations in Milan Trams in Milan Trolleybuses in Milan

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Adapted from the Wikipedia article [Milan Metro Line 4](https://en.wikipedia.org/wiki/Milan_Metro_Line_4) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Milan_Metro_Line_4?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.