Green Line (Stockholm metro)
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| Green Line (Stockholm metro) | |
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| Name | Green Line (Stockholm metro) |
| Native name | Gröna linjen |
| Type | Rapid transit |
| System | Stockholm metro |
| Status | Operational |
| Locale | Stockholm |
| Stations | 49 |
| Opened | 1950–1958 |
| Owner | Storstockholms Lokaltrafik |
| Operator | MTR Stockholm |
| Character | Underground, surface |
| Stock | C20, C30, C30K |
| Linelength | 41.2 km |
| Electrification | 650–750 V DC third rail |
Green Line (Stockholm metro) is one of three main metro lines in Stockholm metro, serving central Stockholm, Södermalm, Kungsholmen, Norrmalm and northern suburbs including Sundbyberg, Solna, Bromma and Täby. The line comprises three branches that converge through the central trunk between Slussen and Sergels torg stations, providing connections to regional rail, tram and bus networks operated by Storstockholms Lokaltrafik and integrated with services by SJ, Mälartåg and Roslagsbanan. It forms a backbone of Stockholm's rapid transit alongside the Red Line (Stockholm metro) and Blue Line (Stockholm metro).
History
The Green Line's origins trace to the mid-20th century when suburban rail conversions and tunnel projects were coordinated by the Stockholm County Council and Stockholms stad authorities. Early sections opened between 1950 and 1958 following plans influenced by post-war urban development by figures and entities such as Sven Markelius and the planning office of Yngve Larsson. Construction linked pre-existing tramways from Södra Station and Hägerstensåsen with new underground sections beneath Sergels torg and T-Centralen. Subsequent expansions in the 1960s and 1970s extended branches toward Akalla and Hagsätra by coordination with national agencies including the Swedish Transport Administration and local utilities. Renovations and modernisation programmes in the 1990s and 2000s were implemented with contractors such as Bombardier, Siemens, and operators like Mera Trafik AB prior to franchising to MTR Stockholm in the 21st century.
Route and stations
The Green Line runs on a trunk route through central Stockholm with three northern and two southern branches, serving 49 stations including interchanges at T-Centralen, Slussen, Fridhemsplan and Odenplan. Key northern termini include Hässelby strand, Åkeshov and Alvik on one arm, while northern suburban extensions reach Sundbyberg centrum and Sigtuna-adjacent commuter interfaces near Barkarby. Southern branches terminate at Hagsätra and Farsta strand, with intermediate stops at growth areas such as Skärholmen, Västertorp and Bandhagen. Stations on the Green Line feature artwork under the Stockholm metro art programme with contributions from artists linked to institutions like the Moderna Museet, Konstakademien and Kungliga Konsthögskolan.
Operations and services
Services are scheduled with high frequency at peak times, coordinated by Storstockholms Lokaltrafik and operated by MTR Stockholm under a public contract that integrates with fare policies governed by the Stockholm County Council and ticketing systems compatible with SL Access cards and mobile validators developed with partners including Cubic Transportation Systems. Timetables ensure connections to Arlanda Express transfers at T-Centralen and to regional rail services by SL Pendeltåg and SJ at stations such as Stockholm City and Odenplan. Operations use signalling compatible with central traffic control centres and maintenance schedules coordinated with entities like Svenska kraftnät for power continuity.
Rolling stock
The Green Line primarily uses the C20 series and newer C30 series metro cars built by Adtranz/Bombardier Transportation and CAF respectively, replacing older C6 and C11 stock that once served lines across Stockholm metro. Rolling stock features stainless steel car bodies, regenerative braking systems, and inter-car gangways similar to fleets in Helsinki Metro and Madrid Metro. Fleet maintenance contracts involve suppliers such as Alstom for components and refurbishment projects have been overseen with expertise from KTH Royal Institute of Technology research partnerships.
Infrastructure and depots
The Green Line's infrastructure includes twin-bore tunnels, cut-and-cover sections and elevated viaducts overseen by civil engineering firms that previously worked on projects with Stockholm County Administrative Board and national bodies. Power is supplied via a third rail system with substations at strategic locations maintained by contractors including ABB. Major depots and workshops serving the Green Line include Högdalen depot, Mälarhov depot and facilities near Alvik co-located with tram maintenance for interoperability with Tvärbanan. Track, signalling and platform work follows standards aligned with International Electrotechnical Commission recommendations and involves turnouts and slab track installations in constrained urban sections.
Ridership and performance
Ridership levels reflect the Green Line’s role within Stockholm’s multimodal transport network, registering millions of passenger journeys annually and peaking during commuting hours tied to employment centers in Norrmalm, cultural venues at Kungsträdgården and academic institutions including Stockholm University. Performance metrics such as punctuality, headway adherence and mean distance between failures are monitored by Storstockholms Lokaltrafik and reported in coordination with the Swedish Transport Administration. Capacity enhancements and crowding mitigation have been supported by data collaborations with Karolinska Institutet for passenger flow studies and with technology partners like Siemens Mobility.
Future plans and extensions
Planned developments consider extensions, station upgrades and fleet replacements coordinated by Region Stockholm and funded through regional transport plans involving the European Investment Bank and national grants. Proposals include capacity increases on central trunk sections, improved accessibility at heritage stations in collaboration with Riksantikvarieämbetet and potential connections to new housing districts proposed by Stockholmshem and private developers. Long-term scenarios reference integration with regional projects such as Bålsta network improvements, freight-light rail interfaces and interoperability studies with Roslagsbanan.