The Kolkata Metro or Calcutta Metro is a mass rapid transit system serving the city of Kolkata and the districts of South 24 Parganas and North 24 Parganas in Indian state of West Bengal. The network consists of one operational line (Line 1) and five lines currently under construction. It was the first such form of transportation in India, opening commercial services in 1984.

After independence, the transport problem of Kolkata drew the attention of the city planners, the State Government and also the Government of India. Efforts to solve the problem by augmenting the existing fleet of public transport vehicles barely touched the fringe of the problem as the roads account for only 4.2% of the surface area in Calcutta, compared to 25% in Delhi and even 30% in other cities.

With a view to finding an alternative solution, the Metropolitan Transport Project (Rlys) (i.e., Railways) was set up in 1973, which recommended a Mass Rapid Transit System. The MTP (Rlys) prepared a master plan in 1971 envisaging construction of five rapid-transit lines for the city of Kolkata, totalling a route length of 97.5 km. Of these, the highest priority was given to the busy North-South axis between Dum Dum and Kavi Subhash (New Garia) over a length of 16.45 km, and the work on this project was sanctioned on June 1, 1972. The foundation stone of the project was laid by Indira Gandhi, the then Prime Minister of India, on December 29, 1972.

Kolkata /kɒlˈkætə/, or Calcutta /kælˈkʌtə/, is the capital of the Indian state of West Bengal. Located on the east bank of the Hooghly River, it is the principal commercial, cultural, and educational centre of East India, while the Port of Kolkata is India's oldest port as well as its sole major riverine port. As of 2011, the city had 4.5 million residents; the urban agglomeration, which comprises the city and its suburbs, was home to approximately 14.1 million, making it the third-most populous metropolitan area in India. As of 2008, its economic output as measured by gross domestic product ranked third among South Asian cities, behind Mumbai and Delhi. As a growing metropolitan city in a developing country, Kolkata confronts substantial urban pollution, traffic congestion, poverty, overpopulation, and other logistic and socioeconomic problems.

In the late 17th century, the three villages that predated Kolkata were ruled by the Nawab of Bengal under Mughal suzerainty. After the Nawab granted the East India Company a trading license in 1690, the area was developed by the Company into an increasingly fortified mercantile base. Nawab Siraj ud-Daulah occupied Kolkata in 1756, and the East India Company retook it in the following year and by 1772 assumed full sovereignty. Under East India Company and later under the British Raj, Kolkata served as the capital of India until 1911, when its perceived geographical disadvantages, combined with growing nationalism in Bengal, led to a shift of the capital to New Delhi. The city was a centre of the Indian independence movement; it remains a hotbed of contemporary state politics. Following Indian independence in 1947, Kolkata—which was once the centre of modern Indian education, science, culture, and politics—witnessed several decades of relative economic stagnation. Since the early 2000s, an economic rejuvenation has led to accelerated growth.

Subhas Chandra Bose ( listen (help·info); January 1897 – 18 August 1945 [unconfirmed]) byname Netaji (Hindi: “Respected leader”) was an Indian revolutionary who led an Indian national force against the British colonizers (and therefore also against the allied Western powers) during World War II. Bose was one of the most prominent leaders in the Indian independence movement and is a legendary figure in India today.

He is presumed to have died "in absentia" on 18 August 1945 from injuries sustained in an alleged aircraft crash in Taihoku (Taipei). However, no actual evidence of the death of Subhas Chandra Bose on that day has ever been officially authenticated and many committees were set up by the government of India to investigate the mystery of his presumed death.

Bose advocated complete unconditional independence for India, whereas the All-India Congress Committee wanted it in phases, through Dominion status. Finally at the historic Lahore Congress convention, the Congress adopted Purna Swaraj (complete independence) as its motto. Gandhi was given rousing receptions wherever he went after Gandhi-Irwin pact. Subhas Chandra Bose, traveling with Gandhi in these travels, later wrote that the great enthusiasm he saw among the people enthused him tremendously and that he doubted if any other leader anywhere in the world received such a reception as Gandhi did during these travels across the country. He was imprisoned and expelled from India. Defying the ban, he came back to India and was imprisoned again.