January 1984; 41 years ago (1984-01) (Initial run) 1 July 2013; 11 years ago (2013-07-01) })[1] 21 November 2017; 7 years ago (2017-11-21) (extended to Silchar)[2]
The express train service was started on 14 April 1987. It operates as train number 12507 from Thiruvananthapuram Central to Silchar and as train number 12508 in the reverse direction serving the 8 states of Assam, West Bengal, Bihar, Jharkhand, Odisha, Andhra Pradesh, Tamil Nadu and Kerala.[4][5]
The 12508 Silchar–Thiruvananthapuram Central Aronai Express covers a distance of 3,915 km (2,433 mi), with a total travel time of 74 hours and 44 minutes, travelling at a speed of 52.60 km/h.