[3] The line was built as a proposal of a mass rapid transit system in Dhaka by the Review Committee of the Strategic Transport Plan and the Urban Traffic Formulation Study.

It was Bangladeshi civil engineer and national professor Jamilur Reza Choudhury, chairman of the Review Committee of the STP, and his team who suggested a mass rapid transit system be included in the plan.

[6] Three years after the preparation of the study report by the World Bank, the Japan International Cooperation Agency (JICA) joined the metro rail project.

[11] As per the proposed route map, the line was supposed to pass in front of Begum Rokeya Hall, one of residential buildings of the University of Dhaka.

Even though the line was planned to pass by Tejgaon Airport, later Prime Minister Sheikh Hasina ordered to change the decision considering national security.

[13] On 18 December 2012, the project was approved by the Executive Committee of the National Economic Council (ECNEC)[14] and in the next year, JICA hired a consultant and financed the construction of MRT Line 6 and its operator Dhaka Mass Transit Company Limited (DMTCL) was established.

They cited the possibility of damage to structures in the university premises, increased traffic jams and disruption to campus activities as reasons for their opposition.

[c][21] On the other hand, Road Transport and Bridges Minister Obaidul Quader ruled out the possibility of moving the metro route from Dhaka University as the construction work would start in two months.

[73] It was decided to shut down metro services for two days for system integration from 14 October to 15 to make the entire line operational.

But at the same time the Northern Route of MRT Line 5 is supposed to be extended to the same place, so next year the STP was revised and its extension destination was changed to Ashulia instead of Baipayl.

[100] On 1 October 2024, the Savar Citizens' Committee staged a human chain appealing to the government to positively reconsider the extension of the line to Nabinagar.

[103] In the next year, the World Bank agreed to give loan of ৳1600 crore (equivalent to ৳18 billion or US$140 million in 2023) for Integrated Corridors Management project for stations in Mirpur and Tejgaon Thana.

In 2017, DMTCL ordered 24 six-car commuter trains to Kawasaki Heavy Industries for the initial part of the line with a price tag of ৳4,257.34 crores.

The trains are powered by 1500 V DC via overhead line rail system,[119][47] are air-conditioned with two air conditioning units in each coach and capable of traveling at up to 100 km/h with ability to increase and decrease 3.5 km/h speed per second.

[140] After the inauguration of the second phase, it was decided to keep the train running at the newly launched Farmgate, Bangladesh Secretariat and Motijheel Metro Station from 7:30 am to 11:30 pm for a total of 4 hours.

[163] Also, on 1 January 2023, metro service was suspended for two hours in the morning after New Year's Eve because a string of sky lanterns fell onto the line's overhead wire.

[178] On 23 January 2024, a downed wire on the metro cable towards Karwan Bazar was the reason the authorities had to stop operations for 15 minutes due to caution.

[180] On 14 February 2024, train service from Motijheel to Uttara North was stopped for an hour after a kite got entangled in an overhead cable at Kazipara.

On the same day, a piece of polythene flew in the air and stuck to the overhead line, forcing metro services to be suspended again to remove it.

[196] On the same day, prime minister Sheikh Hasina asked Japanese Ambassador Iwama Kiminori for the help of the government of Japan in restoring the two stations.

[210] According to a report published by the private research organization Save the Road on 21 August 2022, mismanagement and inefficiency in the construction of the MRT Line 6 resulted in a loss of ৳2,140.12 crores in addition to 11,860 working hours being lost.

In addition, 3,562 people fell ill due to environmental pollution and 54 patients died as they could not get medical treatment by ambulance as soon as possible caused by the construction work on the roads and streets.

[211] According to a news article published by Bangla Tribune, the owners of shopping malls situated along the route of MRT Line 6 suffered losses due to the ongoing construction work in Mirpur area.

[223] In 2018, DMTCL took permission from the Ministry of Housing and Public Works to use the park as a site office and equipment storage area for MRT Line 6.

The DTCA authority in the meeting then assured the minister that there is no scope for corruption as there are various parties including JICA as reviewers in the consultant recruitment process.

[230] In 2023, Syed Imran Saleh Prince, Acting and Organizing Secretary of the Central Office of BNP, claimed that there has been unlimited corruption and irregularities in the construction of MRT Line 6.

Based on that survey, they requested DMTCL on 27 September 2022 for permission to install antennas to maintain an uninterrupted mobile network in station buildings along with prepared plans.

However, the managing director of DMTCL said it was impossible due to technical and architectural reasons and advised the mobile operators to install antennas in the adjacent areas of the route.

[242] According to a survey conducted by Bangladesh University of Engineering and Technology from 17 July to 14 September 2023, 59.41% of passengers using MRT Line 6 used bus transport services in the past.

[246] The bus transport companies have faced financial loss as the number of passengers of the buses has decreased significantly after the second phase of the route was fully operational from Agargaon to Motijheel.