The Chennai Beach–Tambaram electric train scheduled to depart at 11.59 pm will be cancelled from Saturday until October 3. Tambaram–Chennai Beach electric train scheduled to depart at 8.45 pm will be cancelled on September 26, 28, 29 and 30, and October 1, 2 and 3. Tambaram–Chennai Beach electric train scheduled to depart at 11.40 pm will be cancelled on Sunday.

Source: https://www.dtnext.in/news/chennai/chennai-beach-tambaram-midnight-trains-to-be-cancelled-for-8-days-from-september-27