As per the recent announcement released by Southern Railways:
As the cancellation of the electric train operations in the Chennai Beach - Tambaram - Chengalpattu announced earlier has been withdrawn, the trains will operate as usual on 8th September.
As per an earlier announcement, some maintenance work was scheduled in the Tambaram Railway Workshop and as such, the operations of 29 electric trains were to be cancelled on 8th September in the section Chennai Beach - Tambaram (both ways). Also, 11 trains were cancelled in the section Chennai Beach - Chengalpattu (both ways). However, both the above cancellations now remain withdrawn.
As such, Southern Railways have announced that the trains will be operated as usual on the above sections.