The Central Railway, Mumbai Division, will operate a mega block on Sunday, March 23, 2025, to carry out essential engineering and maintenance work on its suburban network. The block will impact services on both the Main Line and Harbour Line, leading to diversions and cancellations.

According to a press release issued by the Central Railway, on the Main Line, train services between Matunga and Mulund on the UP and Down (DN) fast lines will be affected from 11:30 AM to 3:30 PM. DN fast line trains leaving CSMT Mumbai between 10:58 AM and 3:10 PM will be diverted onto the DN slow line at Matunga, halting at all scheduled stations between Matunga and Mulund. These trains will reach their destinations approximately 15 minutes behind schedule. Fast trains beyond Thane will be re-diverted to the DN fast line at Mulund. UP fast line trains leaving Thane between 11:25 AM and 3:27 PM will be diverted onto the UP slow line at Mulund, stopping at all stations until Matunga before rejoining the UP fast line. These trains will also experience a delay of around 15 minutes.