Metro train under Phase II project will enable commuters to switch between two stretches — Corridor 4 and Corridor 5 — seamlessly as they will run parallel to each other for five km. In this project, Corridor 3 and Corridor 5 intersect at Shollinganallur and Madhavaram and again at Thirumayilai. But Corridor 4 and Corridor 5 have four transit stations as the alignment runs along the same direction for about 5 km, with one corridor running above the other. The double-decker stretch will include four stations built at two levels — Alwarthirunagar, Valasaravakkam, Karambakkam and Alapakkam. Corridor 4 will be on the first level and will be constructed at 13.5 meters above the ground and corridor 5 will be raised above this level at a height of 21 meters. These two stretches will run with shared pillars for 5 km and there will be a common concourse (ticketing level) and two different platforms. The advantage is to make commuters from Porur travel quickly to places like Adyar, Mylapore, Shollinganallur, Taramani, Madhavaram, Retteri, Majambakkam and CMBT.
