The 12508 / 16 Silchar - Thiruvananthapuram Central Express covers the distance of  3932 kilometers  in 74 hrs 45 mins (52.60 km/hr), in 76 hrs 35 mins as 12515 Thiruvananthapuram Central - Silchar Express (51.34 km/hr) and in 74 hrs 5 mins as 12507 Thiruvananthapuram Central - Silchar Express (53.07 km/hr).