Reliability of Stockholm Subway - Index of

4.2 Green Line
4.2.1 Line description
It is the oldest and the longest line of Stockholm subway network. The Green line
connects southern and western suburbs of Stockholm municipality with the city
center. The line starts from Hässelby strand in the East then it goes through the
Vällingby, Ängby, Bromma, Kungsholmen, passes along central districts Vasastan,
Normalm, Gamla Stan, Södermalm and reaches the station Gullmarsplan in
Johanneshov, where the line bifurcates into two branches: Skarpnäck/Farsta Strand
and Hagsätra. At Skärmarbrink the branch Skarpnäck/Farsta strands splits again into
the east branch to Skarpnäck and the west one to Farsta strand. The total length of the
line is 41,3 km. It has three metro routes and 49 stations, where 12 of them are
subterranean stations and 37 were constructed above ground. The underground part of
the green line was mostly built with the method “cut and cover”, when the tracks were
placed in the trench dug out in the inner city streets and then covered with protection
shields. This as well as old technical requirements and regulations became the reason
why curves of the line are nowadays tighter and have smaller radius. This caused the
maximum speed limit of 70 km per hour on spans while the Red and Blue lines have
the limit of 80 km per hour. At the platforms maximum allowed speed is 50 km per
hour that is valid on all the subway lines in Stockholm. The rail traffic is left side.
The rail gauge in Stockholm subway is standard and is 1435 mm. Trains of Green line
are run on electricity via third rail located along the track with an unloaded voltage of
750 V DC.
It is possible to define five segments of the Green line:
1. The western (northern) segment (Hässelby strand – Alvik), figure 4.2. It is a
section of 10,6 km long mostly on the surface. The only part of the section of
600 m long between Islandstorget and Blackeberg is in the tunnel. Alvik is a
big transfer station of the section. Between subway tracks at Alvik platform
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