Mumbai, Feb 20 (ANI): Central Railway (CR) will manage the 72-hour mega block of the Harbour Line network between February 19 and 21 to facilitate the smooth extension of Chhatrapati Shivaji Terminus (CST) platform no. 2. While 12 to 15 coaches run on Western Railway (WR) and CR's Main Line, the Harbour Line commuters still travel in nine coaches. Central Railways Public Relations Officer A K Jain on Saturday said they are making tracks for 12 coaches instead of nine. He also said that trains are currently being run at eight-minute intervals for the convenience of commuters.