Central Railway will operate Mega Block on its suburban sections both on main and harbour lines for maintenance work on Sunday.
The work will be carried out between Mulund and Matunga stations on the main line from 11 am to 4.30 pm and on the harbour line between CST and Kurla stations from 11 am to 4 pm, a CR official said.
On the main line, Up fast line services, leaving Thane from 10.50 am to 4.28 pm will be diverted on Up slow line between Mulund and Matunga stations and will halt at all stations between Mulund and Sion during the block, the official said.
On Down harbour line between CST and Kurla station and on Up and Down harbour line between Wadala Road and Bandra stations the maintenance will be carried out from 11 am to 4 pm.
All Down harbour line services for Panvel, Belapur, Vashi leaving CST from 10.39 am to 3.53 pm will run via main line between CST and Kurla and will be further diverted on Down harbour line proper, the official said.