Mumbai : A jumbo block will be undertaken from 11.55pm to 3.55am between Mahim Jn. and Mumbai Central local stations on the Up through (fast) line and fifth line on Saturday and Sunday midnight for maintenance of track, signaling and overhead equipment. During the block, all Up through (fast) line trains will run on Up local (slow) line between Santacruz and Mumbai Central stations. Therefore, there will be no day block on Sunday on Western Railway’s suburban section.