M2 line will reach 23 km when all 16 stations from Haciosman to Yenikapi will be completed; not including the -long Golden Horn Metro Bridge, the 0.6 km long Taksim-Kabatas tunnel connection with the Seabus port, and the 0.6 km long Yenikapi-Aksaray tunnel connecting the M1 line to the Yenikapi Transfer Center.

On the Asian side, construction is in progress of the remaining portion of the 26.5 km long M4