{{Short description|Metro line in Milan, Italy}} {{Infobox rail line | box_width = | name = M4 | color = {{rail color|Milan Metro|M4}} | logo = Milano linea M4.svg | logo_width = 80 | image = M4 San Babila appena inaugurata.jpg | image_alt = | caption = [[San Babila (Milan Metro)|San Babila station]] | type = [[Rapid transit]] | system = [[Milan Metro]] | status = Operational | locale = [[Milan]], [[Italy]] | start = | end = | connectinglines = {{ric|Milan Metro|M1}} {{ric|Milan Metro|M2}} {{ric|Milan Metro|M3}} | stations = 21 | routes = | daily_ridership = 40,000 (July 2023-February 2024)<ref>{{cite news |title=Milan: from Monday extended hours on the M4 metro line |url=https://www.agenzianova.com/en/news/Milan-extended-hours-on-the-M4-metro-line-from-Monday/ |access-date=25 April 2024 |work=Agenzia Nova |date=14 February 2024 |language=en}}</ref> | ridership2 = | open = {{start date and age|26 November 2022}} | lastextension = 12 October 2024 | owner = | operator = [[Azienda Trasporti Milanesi]] | depot = | stock = [[Hitachi Rail Italy Driverless Metro]] | linelength = {{convert|15.2|km|abbr=on}} | tracklength = | tracks = | gauge = {{track gauge|sg|allk=on}} | minradius = | racksystem = | electrification = {{750 V DC|conductor=third rail}} | speed = | elevation = | website = {{Official website}} | map = [[File:Milano - mappa metropolitana M4.svg|300px]] }}
'''Line 4''' is an underground [[rapid transit]] line in [[Milan]], [[Italy]], part of the [[Milan Metro]]. The line is {{convert|15.2|km|abbr=on}} long with 21 stations.<ref name="metropolitanamilanese">{{cite web|title=Linea 4|url=http://www.metropolitanamilanese.it/pub/page/it/MM/metropolitane_milano?contentId=924|website=www.metropolitanamilanese.it|publisher=Metropolitana Milanese|accessdate=22 July 2015|archive-date=15 June 2013|archive-url=https://web.archive.org/web/20130615164227/http://www.metropolitanamilanese.it/pub/page/it/MM/metropolitane_milano?contentId=924|url-status=dead}}</ref>
The line was opened in stages between 2022 and 2024.<ref name="MT"/><ref name="ilgiorno2023">{{cite news |title=M4, apre la nuova tratta San Babila-Linate: oggi si viaggia gratis. Tutto quello che c'è da sapere |url=https://www.ilgiorno.it/milano/cronaca/metropolitana-m4-nuova-gratis-festa-fermate-glf2313b |access-date=4 July 2023 |work=Il Giorno |date=3 July 2023 |language=it}}</ref> It features [[Automatic train operation|automatic driverless trains]]<ref name='cronacamilano'>{{cite web|title=Metropolitana M4 approvata, realizzazione Linate – Lorenteggio al via|date=22 November 2010 |url=http://www.cronacamilano.it/cronaca/3268-metropolitana-m4-approvata-realizzazione-linate-lorenteggio-al-via.html|publisher=Cronaca Milano|accessdate=26 September 2011}}</ref> and is designed for a capacity of 24–28,000 passengers per hour in each direction.<ref name="MM1">{{cite web |title=Milano M4 |url=http://87.248.52.211/pub/page/it/MM/metropolitane_milano?contentId=924 |publisher=Metropolitana Milanese |accessdate=28 December 2011 |archive-date=23 December 2017 |archive-url=https://web.archive.org/web/20171223043347/http://87.248.52.211/pub/page/it/MM/metropolitane_milano?contentId=924 |url-status=dead }}</ref> 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 [[Expo 2015|Milan Expo]]. However, delays in planning, financing<ref>{{cite web|title=Tabacci: a rischio il secondo lotto della M4|url=http://milano.corriere.it/milano/notizie/cronaca/11_luglio_29/tabacci-m4-rischio-finanziamenti-expo-1901201418693.shtml|publisher=Corriere della Sera Milano|accessdate=26 September 2011}}</ref> and construction works forced to postpone the opening, with the first section opening on 26 November 2022<ref name="MT">{{Cite web |date=21 October 2022 |title=Apre la nuova metro di Milano: c'è la data per l'inaugurazione della M4, la linea blu |url=https://www.milanotoday.it/attualita/metro-4-blu-quando-apre-data-ufficiale.html |access-date=21 October 2022 |website=MilanoToday |language=it}}</ref><ref>{{cite web|title=Metrò 4, aprono i cantieri|url=http://milano.corriere.it/milano/notizie/cronaca/11_maggio_10/metropolitana-4-linea-blu-aprono-cantieri-190606819302.shtml|publisher=Corriere della Sera Milano|accessdate=26 September 2011}}</ref> and the rest of the line expected to open by 2023.<ref name=":1">{{cite web|url=https://www.milanotoday.it/attualita/metro-m4-ritardi-apertura.html|title=L'apertura della linea M4 a Milano slitta per ritrovamenti archeologici (e covid)|website=MilanoToday|language=it|access-date=21 May 2021}}</ref> The line is {{convert|15|km|abbr=on}} long with 21 stations, with its final 13 stops opening on 12 October 2024.<ref name=phase3open2024/>
The consortium [[Azienda Trasporti Milanesi|ATM]]-[[Webuild]] is responsible for the construction works.<ref name=lavori /><ref name=jan12>{{cite news|title=Tar: "Metrò 4, gare regolari". Via ai cantieri|url=http://milano.corriere.it/milano/notizie/cronaca/12_gennaio_21/metro-quattro-gare-regolari-cantieri-al-via-santucci-stella-1902954594007.shtml|accessdate=22 January 2012|newspaper=Corriere della Sera|date=21 January 2012}}</ref>
Of the total estimated cost of about €1.7 billion, the [[Government of Italy]] will cover €786 million via a grant, the municipal [[government of Milan]] will cover €400 million, and €512 million will be funded by private investors.<ref name="lavori">{{cite web|title=M4, lavori assegnati a Impregilo e Atm|url=http://milano.corriere.it/milano/notizie/cronaca/11_maggio_27/metropolitana-quattro-190741492144.shtml|publisher=Corriere della Sera Milano|accessdate=26 September 2011}}</ref>
==Route== [[File:Maurizio lupi inaugura metropolitana m4 talpa linate 24 marzo 2014 2 (13377872183).jpg|thumb|left|[[Tunnel boring machine]]s used in the project, 2014]] [[File:ForlaniniFS-metro4.jpg|thumb|left|Forlanini FS station under construction in 2016]] The line connects the south-western neighborhood of ''Lorenteggio'' with [[Linate Airport]] on the east, passing through the city center. All stations are underground.
{| class="wikitable" |- ! Station Name !! Transfer !! Opening |- |{{stl|Milan Metro|San Cristoforo FS}} |{{ric|Trenord|S9}} {{ric|Trenord|S19}} [[File:tren.svg|18px]] | rowspan="13" |12 October 2024<ref name=phase3open2024>{{cite news |title=C'è una data per l'apertura di tutta la linea M4 |url=https://www.milanotoday.it/attualita/m4-data-inaugurazione.html |access-date=25 September 2024 |work=MilanoToday |language=it}}</ref> |- | Segneri | |- | Gelsomini | |- | Frattini | |- | Tolstoj | |- | Bolivar | |- | California | |- | Coni Zugna | |- | [[Sant'Ambrogio (Milan Metro)|Sant'Ambrogio]] | {{ric|Milan Metro|M2}} |- | De Amicis | |- | Vetra | |- | Santa Sofia | |- | Sforza-Policlinico | {{ric|Milan Metro|M3}}{{efn|name=OSI|Out-of-system interchange at [[Missori (Milan Metro)|Missori]]}} |- | [[San Babila (Milan Metro)|San Babila]] | {{ric|Milan Metro|M1}} | rowspan="2" |4 July 2023 |- | Tricolore | |- | {{stl|Milan Metro|Dateo}} | {{ric|Trenord|S1}} {{ric|Trenord|S2}} {{ric|Trenord|S5}} {{ric|Trenord|S6}} {{ric|Trenord|S12}} {{ric|Trenord|S13}} | rowspan="6" |26 November 2022<ref name="MT" /> |- | {{stl|Milan Metro|Susa}} | |- | {{stl|Milan Metro|Argonne}} | |- | {{stl|Milan Metro|Stazione Forlanini}} | {{ric|Trenord|S5}} {{ric|Trenord|S6}} {{ric|Trenord|S9}} |- | {{stl|Milan Metro|Repetti}} | |- | {{stl|Milan Metro|Linate Aeroporto}} | [[File:Pictograms-nps-airport-2.svg|18px]] |- !colspan="3"|Notes |- |colspan="3"|{{notelist}} |}
==Rolling stock== The line uses [[Hitachi Rail Italy Driverless Metro]] [[Automatic train operation|automatic driverless trains]].<ref name='cronacamilano'/> The line will be operated by 37 four-car EMUs manufactured by [[Hitachi Rail Italy]] at [[Reggio Calabria]]. Because of production problems caused by the [[COVID-19 pandemic]], some were sent to [[Hitachi Newton Aycliffe]] in England for final fitting out.<ref>Milan Metro cars in Newton Aycliffe ''[[The Railway Magazine]]'' issue 1436 November 2020 page 9</ref>
==See also== {{commons category|Line M4 (Milan metro)}} *[[Transport in Milan]] *[[Milan S Lines]]
==References== {{Reflist}}
{{Urban rail transport in Milan}}
[[Category:Milan metro lines|4]] [[Category:Railway lines opened in 2022]]