Railway electrification in India began with the first electric train (1500 V DC), between Bombay Victoria Terminus and Kurla on the Great Indian Peninsula Railway's (GIPR) Harbour Line, on 3 February 1925. Steep grades on the Western Ghats necessitated the introduction of electric traction on the GIPR to Igatpuri on the North East Line and to Pune on the South East Line. 1500 V DC traction was introduced on the suburban section of the Bombay, Baroda and Central India Railway between Colaba and Borivili on 5 January 1928, and between Madras Beach and Tambaram of the Madras and Southern Mahratta Railway on 11 May 1931, to meet growing traffic needs. The last sections of 1500 V DC in India, from Chatrapati Shivaji Terminus Mumbai to Panvel and Thane to Vashi, were upgraded to 25 kV AC in April 2016.