[10] This was later named the Yellow Line, and BMRCL explored the option of developing it as a public-partnership project, but these plans were later abandoned.

Biocon CMD Kiran Mazumdar Shaw stated that the company wanted to fund the project because it would help de-congest the city.

[14] Tenders for the 6.385 km (3.967 mi) stretch from Hosa Road to Bommanahalli (previously HSR Layout) were floated the next day.

BMRCL began the land acquisition process in early 2017 and civil works started in November 2017.

BMRCL awarded the construction of the Hebbagodi Depot to Parnika Commercial & Estates in July 2019 while simultaneously preparing the tender for rolling stock.

[20] On 2 December 2019, BMRC awarded a contract for supplying 90 coaches (15 rakes) to CRRC Nanjing Puzhen Co. Ltd with CBTC signaling for the Yellow Line.

[21] CRRC had entered into a partnership with Titagarh Rail Systems Limited (TRSL) to meet the condition that at least 75% of the coaches be made in India.

Later TRSL reported that the first train set delivery had been pushed to November-December, causing a December opening to be unlikely.

In 2018, the Infosys Foundation and BMRCL signed an Memorandum of Understanding for the construction and maintenance of the Konappana Agrahara metro station.

Infosys Foundation will provide ₹115 crore (US$13 million) for the construction of the station while 3000 square feet of the station land was allocated to the foundation for its own use and a direct construction of a foot over bridge from the metro to the Infosys Campus was approved.

In 2019 the government approved renaming the station to "Infosys Foundation Konappana Agrahara" for a period of 30 years.

Similarly, in December 2024 BMRCL and Delta Electronics signed an agreement to provide ₹55 crore (US$6.4 million) for the construction of the Bommasandra station.