Chennai Metro Rail Corporation is not only building tunnels for the underground metro line but is simultaneously constructing underground stations along the stretch. The metro corridor will have four underground stations at Shenoy Nagar, Anna Nagar East, Anna Nagar Tower and Thirumangalam. The work on Thirumangalam station, Shenoy Nagar and Anna Nagar Tower is moving at a rapid pace. The tunnel for the Shenoy Nagar-Thirumangalam metro rail stretch will be ready by mid-next year. A second parallel tunnel is also under construction. The underground stretch would connected the elevated line from Koyambedu to Alandur and St Thomas Mount. This line will be commissioned by March 2015.