[11] The 23.33 km (14.50 mi) elevated Line 3 Puneri Metro will run from the Rajiv Gandhi Infotech Park in Hinjawadi via Balewadi to Civil Court.

[12] The two lines with a combined length of 32.97 km (20.49 mi) are being implemented by the Maharashtra Metro Rail Corporation Limited (MahaMetro), a 50:50 joint venture of the state and central governments.

[28][29] Such a high density of traffic has put the urban transport system in Pune under severe stress leading to longer travel time, increased air pollution and rise in number of road accidents.

[33] In 2010, the Pune Municipal Corporation (PMC) delayed submitting the proposal to the Union government to make provisions in the annual budget for the project.

[49] The underground station at Swargate will be a part of a multimodal transit hub integrating intra- and inter-city bus services run by PMPML and MSRTC, autorickshaws, as well as parking facility for private vehicles.

[53] In April 2018, MahaMetro began construction in the Kharalwadi and Morwadi area on the elevated stretch of the line between PCMC Bhavan and Range Hills.

MahaMetro claimed it to be temporary and revealed that an earlier plan to construct the pillars on the footpath was dropped due to utility lines running below the surface.

[54][55] However, the PCMC conducted trials on the BRTS route in April 2018 and intended to launch services soon and therefore ordered MahaMetro to stop construction.

[57][58] Ever since the Centre gave its nod for the first two metro corridors, there has been a demand for extending the Purple line from PCMC Bhavan to Bhakti Shakti Chowk, Nigdi.

[61] However, on 18 January 2018, MLA and Pune's Guardian Minister Girish Bapat announced in his speech at the ground-breaking ceremony for the first metro station at Sant Tukaram Nagar that work on the extension would be taken up only in the "second phase" of the project without mentioning a timeline.

[62] As a result, confusion ensued and social organizations in Pimpri, Chinchwad, Akurdi held a token hunger strike in February 2018 to press their demand for extension.

[64] In October 2018, MahaMetro submitted the DPR for the 4.5 km (2.80 mi) long extension to the PCMC with an estimated cost of ₹947 crore (US$110 million).

[72][73] In December 2024, the Pune Municipal Corporation and MahaMetro mutually decided to construct a fourth metro station on this route at Balajinagar.

[75][76] In November 2015, a revised proposal submitted to the PMC by the DMRC suggested realigning the route along the Mutha river as against the earlier alignment along Jangali Maharaj Road to reduce the project cost.

A permanent exhibition depicting the life of Shivaji - the Shivsrushti (Marathi: शिवसृष्टी) project - which was also planned at the same location, will instead be built on the land reserved for a biodiversity park near Chandani Chowk.

A DPR is being prepared for the 2 km (1.24 mi) long extension and an additional station between Vanaz and Shivsrushti (Chandani Chowk) at Bhusari Colony is being contemplated.

[42][91][92] The line will also connect to the multimodal transit hub planned along the National Highway 48 in Balewadi which will integrate the inter- and intra-city bus services and BRTS operated by the MSRTC and PMPML.

[112] The delay in the execution of the project has resulted in an upward revision of ₹ 700 crores (US$107.8 million) in the draft civic budget for 2015-16 presented by Municipal Commissioner Kunal Kumar.

[115] On 28 January 2019, the Department of Economic Affairs on behalf of the Centre and the AFD signed a facility framework agreement to extend bilateral funding of ₹2,000 crore (US$230 million).

[113] To alleviate the confusion, Chief Ministers of Maharashtra announced that Pune will get "mixed-metro", as the alignment of some routes does support elevated sections.

[135] Adding further, the citizens group supported their cause by stating that it would take another 5 years after phase II gets approval from Union Cabinet for metro to reach core PCMC administered areas.

In May 2016, an environment interest litigation (EIL) was filed in the western zone bench of the National Green Tribunal (NGT) against the realignment of Line 2 from Jangali Maharaj Road to the Mutha River bed.

[77][136] The litigants MP Anu Aga, Sarang Yadwadkar, Arti Kirloskar and Dileep Padgaonkar expressed concerns over free flow of the river being obstructed by the pillars supporting the 1.7-km stretch of the metro viaduct.

[137] The NGT put an interim stay on metro construction in the river bed on 2 January 2017, days after the foundation stone was laid on 24 December 2016.

[140][141] Subsequently, after the MahaMetro was formed and became a respondent in the EIL, it unsuccessfully moved the Supreme Court challenging the NGT's jurisdiction on the case.

[142] In October 2017, the NGT resumed the hearing and appointed an expert committee convened by the National Environmental Engineering Research Institute (NEERI) to study the impact of the metro project on the river bed.

The clearance is subject to MahaMetro complying with the recommendations made by the three-member expert committee, which had concluded that the construction would not damage riverbed hydrology.

[150][151][152] The DMRC had proposed 4 FSI on either side of the corridor to achieve greater population densification through vertical development of residential and commercial properties.

A 60% share of this fund should be used for the metro project, while 15% for the PMPML and high capacity mass transit road and monorail and 25% for developing basic infrastructure.

The notification restricts the construction of high-rise buildings and has made 4 FSI along the metro corridor under the transit-oriented development policy impossible.