[5][6] In 2007, as follow up to the Metro Phase that was about to begin construction then, RITES had recommended several mono-rail routes totaling 60 km (37 mi).

These recommendations were made as Government of Karnataka requested a survey of feeder routes for Phase l of metro that was to begin construction.

[7] At that stage, Bannerghatta Road was not expected to have high growth and dense population, hence the recommendation for Monorail.

[10] Cantonment Metro Station would instead be built under a playground belonging to Bruhat Bengaluru Mahanagara Palike (BBMP), near Bamboo Bazaar.

[3] Due to long underground section with tunneling in difficult geology, the cost of the Pink Line was expected to be high.

[14][15] BMRCL initially floated tenders for the construction of the 13.9 km (8.6 mi) underground section in four packages during June 2017.

BMRCL initially awarded the Reach 6 Elevated section to Simplex Infrastructures on 8th September 2017 for a cost of ₹578.70 crore (US$67 million).

However, following the poor progress by the company BMRCL terminated the contract and called for a fresh tender to finish the remaining works on February 2021.

Tunnel boring work by Afcons with three TBMs (Varada, Rudra and Vamika) on the section between Rashtriya Military School and Dairy Circle began during March–June 2021 period.

[25][26] In May 2017, BMRC received in-principle approval from the European Investment Bank (EIB) to fund construction of the Kalena Agrahara-Nagawara line through a ₹3,700 crore (US$430 million) loan.

[27] The BMRC secured an agreement with the Asian Infrastructure Investment Bank (AIIB) on 4 June 2019 to receive a soft loan of ₹2,255.14 crore (US$260 million) to be repaid over a period of 25 years.

Passenger interchange facilities, connecting to other metro and railway lines, will be provided at the following stations: Parijaata  (Approved)