Central Organisation for Railway Electrification

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.

The electrification of the Howrah-Burdwan section of the Eastern Railway at 3000 V DC was completed in 1958. The first 3000 V DC EMU service began on the Howrah-Sheoraphuli section on 14 December 1957. The last section of 3000 V DC in India, from Howrah to Burdwan, was upgraded to 25 kV AC in 1968.

The 25 kV AC system emerged as an economical form of electrification as a result of research and trials in Europe, particularly on French Railways (SNCF). Indian Railways decided to adopt the 25 kV AC system of electrification as a standard in 1957, with SNCF their consultant in the early stages, later taken over by the "50 c/s Group". The joint venture was founded in 1954 by several European railway manufacturers and was dedicated to the development and construction of locomotives powered by 50 Hz alternating current. It arranged the supply contracts for the WAM-1, WAG-1 and WAG-3 locomotives and its spare parts.

The first section electrified with the 25 kV AC system was Raj Kharswan–Dongoaposi, on the South Eastern Railway, on 15 December 1959 and first electric train run. The first 25 kV AC EMUs, for Kolkata suburban service, were introduced in September 1962.

The electrification office was established in Calcutta as Project Office for Railway Electrification (PORE) in 1951, when electrification of the Howrah–Burdwan section of the Eastern Railway was begun. A general manager headed the Railway Electrification Organisation, established in Calcutta in 1959. In 1961, the Northern Railway electrification office (headed by an engineer-in-chief) was established in Prayagraj for the electrification of the Mughalsarai–New Delhi section. In accordance with the 1978 J. Raj Committee report, a number of electrification projects were included and a railway-electrification headquarters established. Since most of the electrification projects were in Central and South India, the electrification headquarters was established in Nagpur under an additional general manager from 1982 to 1984. The headquarters was moved to Prayagraj under the additional general manager in January 1985 and was renamed Central Organisation for Railway Electrification (CORE). A general manager was appointed in July 1987.

On 31 March 2019, the number of electric locomotives was 6,059.[4] As part of its modernisation plan, Indian Railways imported eighteen 6,000-horsepower thyristor locomotives with technology transfer; they are now produced at the Chittaranjan Locomotive Works (CLW). Indian Railways have developed chopper technology for DC electric multiple units in collaboration with the Bhabha Atomic Research Centre (BARC), and 20 motor coaches with chopper technology will be placed in service. In addition to being less maintenance-intensive, chopper technology is expected to have an energy savings of 30 to 34 percent in suburban service.

To reduce maintenance costs and improve the reliability of power-supply systems, CORE has adopted state-of-the-art technology: cast resin transformers, SF₆ circuit breakers or vacuum switchgear, long-creepage solid-core insulators and PTFE-neutral sections. Eight-wheeled, self-propelled OHE inspection cars have been introduced to improve maintenance, and an OHE recording car has been requested to monitor the performance of overhead equipment.

The 220-132-25 kV power-supply network for electrification extends along the track for about 200 to 300 kilometres (120 to 190 mi). It is remotely controlled from the division control centre to ensure an uninterrupted power supply to the track overhead equipment. In electrification projects, a microprocessor-based supervisory control and data acquisition control system is replacing the earlier electro-mechanical Strowger system of remote-control equipment. SCADA can telemeter voltage, current, maximum demand and power factor on a real-time basis, enabling control of maximum demand and electrical cost. The system also provides automatic troubleshooting and isolation of faulty sections.

Signalling systems are also being upgraded, with the semaphore signalling system being replaced by a coloured-light signalling system. Colour light signals are more visible to train drivers, improving safety and efficiency. The interlocking system is being changed to panel or relay interlocking.

Indian Railways have implemented communications technology using optical fibre cable. On 31 March 2019, 55,835 rkm of optical fibre cable had been commissioned. Railway-control communications, essential for train operations, are also being transferred to OFC. Control communications on 55,835 rkm have been shifted to OFC.[4] Optical-fibre technology has also aided mobile telephony from moving trains. With this technology, the driver and guard can talk to each other (and to the control centre) from a moving train; this would be especially useful in an emergency.