Central Railways has proposed to SWR , SCR , SR authorities for change of timings and routes of trains No. 16339/40 MUMBAI CST-NAGERCOIL-MUMBAI (4-day week) via Wadi, Renigunta, Arakkonam, Jolarpettai and 16331/32 TRIVANDRUM CENTRAL-MUMBAI CST (weekly) via Roha, Mangalore instead of existing route and timings.