Starting January 1, 2026, 24 train services in Tamil Nadu — including trains that run through Tirunelveli — will have their numbers changed by Southern Railway. This renumbering affects passenger information systems, ticketing, and railway announcements, and is part of an update to streamline train identities for better clarity and operations. Services impacted include trains on routes serving Tirunelveli, Sengottai, Thoothukudi, and other regional connections. Passengers are advised to check official railway notifications for updated train numbers and schedules before planning their travel.