was operated by Madras Railway from Royapuram to Wallajah Road (Arcot) in 1856. MR extended its trunk route to Beypur / Kadalundi (near Calicut) and initiated work on a north-western branch out of Arakkonam in 1861. The branch line reached Renigunta in 1862, and to Raichur in 1871, where it connected to the Great Indian Peninsula Railway line from Mumbai. Electrification Railway electrification in India began with the first electric train, between Bombay Victoria Terminus and Kurla by the Great Indian Peninsula Railway's (GIPR) on 3 February 1925, on 1.5 kV DC. The Kalyan–Pune section was electrified with 1.5 kV DC overhead system in 1930. The previously used 1.5 kV DC was converted to 25 kV AC on 5 May 2013 from Kalyan to Khopoli and Kalyan to Kasara. Conversion from 1.5 kV DC to 25 kV AC on the Lokmanya Tilak Terminus-Thane-Kalyan section was completed on 12 January 2014. The CSMT to LTT section was converted from 1.5 kV DC to 25 kV AC on 8 June 2015. The Kasara-Pune section was also converted from 1.5 kV DC to 25 kV AC. The Pune–Daund section as well as Daund-Bhigwan section was electrified in 2017. The electrification of the Bhigwan-Kalaburgi section was completed by March 2022. The Kalaburgi-Wadi section was electrified in 2018. The Renigunta–Nandalur sector electrification was completed in 2006. The Nandalur–Guntakal sector was electrified by Dec 2013. The electrification of the Guntakal-Wadi section was completed in 2015. The Puratchi Thalaivar Dr. M.G. Ramachandran Central Railway Station–Tiruvallur sector, as well as the Basin Bridge–Chennai Beach sector were electrified in 1979–80. The Tiruvallu–Arakkonam sector was electrified in 1982–83, Arakkonam–Tiruttani sector in 1983–84 and the Tiruttani–Renigunta sector in 1984–85. Hence, the entire Mumbai-Chennai route is completely electrified. Speed limit The stretch between Chhatrapati Shivaji Maharaj Terminus and Kalyan is classified as 'Group A' line, where trains can take speed up to 160 km/h. The Kalyan–Pune–Daund–Wadi line and the Wadi–Raichur–Adoni–Arrakonam–Puratchi Thalaivar Dr. M.G. Ramachandran Central railway station line are classified as 'Group B' lines and can take speeds up to 130 km/h. Passenger movement CST Mumbai, Pune, Solapur and MGR Central, on this line, are amongst the top hundred booking stations of Indian Railway. References External links Trains at Mumbai CST Trains at Pune Trains at Daund Trains at Solapur Trains at Wadi Trains at Raichur Trains at Adoni Trains at Guntakal Trains at Chennai Central 5 ft 6 in gauge railways