Line 1 runs mostly north–south. A , three station extension of the line from Mirdamad station to Qolhak station opened on May 20, 2009. The , four stations second phase of this extension from Qolhak station to Tajrish Square was completed in 2011. Construction was to be completed by March 2007 but faced major issues due to large boulders and rock bed in part of the tunnels as well as water drainage issues. It has also faced major financing issues as the government has refused to release funds earmarked for the project to the municipality.