CHENNAI: Tamil Nadu and Kerala, two of India’s most developed states, use internet to book around 80% of their train tickets. According to data obtained by TNIE via RTI, percentage of paper tickets stood at 26-28% in Southern Railway (SR) in 2018, with national average being 35%. During 2019-2020, paper-ticket percentage fell to 22.8 and further to 21.5 during 2021-22.