Chennai Central–Madurai AC Superfast Express
The Chennai Central–Madurai Junction Central SF Express is a Superfast express train connecting Chennai and Madurai which lies in Southern Railway zone of Tamil Nadu State in India. This was the first train operated by Southern Railways with newly manufactured AC Three Tier Economy Coach. This train will be operated from weekly to tri-weekly with effect from 10 June 2020 from Chennai and 11 June 2020 from Madurai. There is no changes in timings. It will depart from Chennai on every Monday, Wednesday and Friday. Earlier it used to run as a  fully air conditioned express, but after August 2021, 4 Sleeper Class coaches were attached. Initially it ran only one day a week from Chennai Central - Madurai by sharing its rakes with Chennai Central - Madurai AC Duronto Express. After June 2020, Duronto Express was fully cancelled and it was made into run on the days which Duranto ran. Also additional stoppages were given at Katpadi, Karur, and Dindigul. In return it will leave from Madurai on every Tuesday, Thursday and Sunday. It was the first train to carry AC Three Tier Economy Coach in Southern Railway, though some trains carrying 3  Tier Economy Coach passes through Southern Railway Zone, they aren't belonged to Southern railway. From 25th February 2021, it will run with 1 more additional coach, i.e., AC Three Tier Economy. There are also proposal plans to extend this train to the newly gauge converted railway line of Madurai Teni section along with stoppages at Perambur, Thiruvallur, Arakkonam, Jolarpettai, Namakkal, Usilampatti, Andipatti. Overview. This train was inaugurated on 3 November 2017, as weekly frequency train service. It was Flagged off by Piyush Goyal (Minister of Railways) and Edappadi K. Palaniswami (Chief Minister of Tamil Nadu), For making less time  and comfortable journey for Chennai and Madurai Commuters. Coach Composition. Till June 2020, 20601/02 MAS - MDU - MAS AC Express had following Coach Position when it ran with ICF Coaches, After receiving LHB rakes it had revised composition, From September 2021 it had been attached with 4 Sleeper Classes and the name AC Express had been withdrawn, and was called as Central Express. Till 24rth February 2022, it had following Coach composition, 20601/20602 Chennai Central - Madurai Junction Central SF Express has, At Present it runs with following Coach composition, Routes. This train with the number of 20601/20602 passes through , , and , with  the length of 556 km with an average speed of 62 km/hr. Halts. When it ran as 12277/78 Chennai Central - Madurai Duronto AC SF Express it has its stoppage only at, Now 20601/02 Central SF Express has stoppages at, 20602 Has additional stoppage at Perambur, to avoid rushing in Central. Traction. WAP-4 & WAP-7 of Arakkonam, Royapuram & Erode loco shed pulls this train at both directions. Demands. There are also demands to stop this train at Namakkal, Jolarpettai, Arakkonam, Thiruvallur and Perambur Railway stations.