The Chennai Suburban Railway is a commuter rail system in the city of Chennai, Tamil Nadu, India, operated by the Southern Railways branch of Indian Railways. It is the second largest suburban rail network in terms of route length and the third largest in terms of commuters in India. Around 1,000 services are operated daily between 4:00 a.m. and midnight. It is the longest suburban circular route in India covering of .
Chennai has a complex railway network. It is the third busiest suburban rail system in India after Mumbai and Kolkata. It has separate tracks for local and express trains. The system uses electrical multiple units (EMUs) operating on alternating current (AC) drawn from overhead wires through the catenary system. The total system spans around of which only have dedicated dual tracks for suburban EMUs, the rest share tracks with other trains and are called mainline EMUs (MEMUs). As of 2013, the suburban sector has 1,000 services, including 250 in the Beach–Chengalpattu section, 240 services in the Chennai Central–Arakkonam section, and 90 in the Chennai Central–Gummidipoondi. As of 2020, 2.5 million people use the suburban train services daily and 401.72 million passenger every year. This includes 8,20,000 in the Beach–Tambaram section, 5,50,000 in the Central–Pattabhiram section, and 2,00,000 in the Central–Gummidipoondi section and 2,00,000 in the MRTS section. This is a 13.2 percent increase over the previous year. A total of 65 stations in the suburban section have bicycle stands.
History
Chennai has a fairly extensive suburban electric multiple unit (EMU) service. It was in the 1920s that the then British government felt the necessity of connecting the northern part of the city, which was mainly commercial, with the chiefly residential southwestern parts. In 1928, work began on constructing two meter gauge (MG) lines connecting the harbour with the southern suburb of Tambaram to run services using steam locomotives. In early 1930, however, the government decided to electrify the lines, including the mainline starting from Egmore. The plan to electrify railway lines in Madras was first initiated in 1923 by Sir Percy Rothera, an agent of the South Indian Railways. This was on account of the city's rapid expansion, with largely agricultural areas such as Saidapet, St. Thomas Mount and Tambaram developing into residential quarters. Plan to build a new line between Beach and Egmore and two lines between Egmore and Tambaram was announced as part of the suburban remodelling initiative of South Indian Railways. The rolling stock, consisting of rigid wooden-bodied coaches, were built by Metro-Cammell. On 27 December 1930, the first consignment of 25 electric carriages from England was received by the railway. The trains were painted in dull green with a black wheel base and featured wide sliding doors, a better-designed seating arrangement, and thick glass fronts. The new carriages were parked in Tambaram station. By March 1931, the construction works were completed, and the first electrically operated rail service in Madras began on 2 April 1931 between Madras Beach and Tambaram, which became the earliest metre gauge to be electrified in the country. It was launched by Sir George Fredrick Stanley, the then governor of Madras, who at the opening ceremony was reported to have said that the new train services would transform "desolate south Madras into burgeoning garden cities".
However, the suburban services were opened to the public only a month later on 11 May 1931. The section was electrified on 15 November 1931, with the first MG EMU services running on 1.5 kV DC. The Madras Electricity Supply Corporation, which powered the railway lines, was aided by sub-stations in Egmore and Meenambakkam. Soon, the number of trains shuttling passengers was increased to 45 a day, running every 10 minutes at peak hours, and every 30 minutes, otherwise. The running time between Madras Beach and Tambaram stations, which was 2 hours until then, was reduced to 49 minutes. The train service was made available from 4:00 in the morning up to 12:00 at night.
In the same year, mainline DC locomotives (YCG) were introduced to haul freight from the port. The system had the meter-gauge (MG) EMUs (YAU series) until the gauge conversion. Since then, the system has only the broad-gauge (BG) EMUs running.