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This ARO started functioning in 1939 under the administrative control of HQ Rtg Zone, Bangalore. This Office was re-organized as ARO in 1969 and was placed under HQ Rtg Zone, Chennai on 01 Jul 1984. ARO Tiruchirappalli covers districts Perambalur, Ariyalur, Tiruchirappalli, Karur, Thanjavur, Thiruvarur, Nagapattinam, Pudukkottai, Sivagangai, Ramanathapuram, Virudhunagar, Tuticorin, Tirunelveli, Kanyakumari and Karaikal.