The €216m project involves constructing a link between the southern terminus of the Green Line at Cais do Sodré and Rato on the Yellow Line to form a metro ring in the city centre. Two new stations are planned at Estrela and Santos.
The circular line will take over the section of the Yellow Line between Rato and Campo Grande, while the Telheiras - Campo Grande stretch of the Green Line will become part of the Yellow Line.
Construction is expected to begin in 2019. When the project is completed, six-car trains will operate on the circular line with peak headways of 3min 40.
In the meantime, work continues to adapt stations on the Green Line for six-car operation and improve accessibility.
In addition, Lisbon Metro is planning to acquire 33 new metro cars at a cost of around €50m as part of the Operational Development Plan.
A 2km two-station extension from São Sebastião to Amoreiras and Campo de Ourique is also proposed, although no decisions have been made on financing or the construction timetable for €186.7m project.
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