![]() In October 2018, the MMRDA announced that it would construct Metro 4 along with three flyovers to ensure smooth flow of traffic, with the metro running on the upper deck of the flyover. The proposed 8 km (5.0 mi) extension is estimated to cost ₹300 crore per km. In March 2017, the MMRDA stated that it was conducting a pre-feasbility study on extending the line from Wadala to Mumbai General Post Office in South Mumbai, via the Mumbai Port Trust. The aerial survey takes less time than a regular survey, achieves greater accuracy and helps protect against false claims for compensation. The drones were fitted with 360 degrees camera that provide up to 3 millimetres (0.12 in) accuracy. The MMRDA utilized a drone to carry out survey work for Metro 4. The MMRDA will construct metro car depots for the line on a 30 hectare plot at Owala village in Thane district and another in Vikhroli. 48 piers are proposed to built in the CRZ II. ![]() Over 1 km (0.62 mi) of the line passes over water bodies in Bhakti Park and Wadala, both areas classified as Coastal Regulation Zone II where CRZ rules limit construction activities. The Maharashtra Coastal Zone Management Authority granted Coastal Regulation Zone (CRZ) to the project in February 2017. The foundation stone for Metro 4 was laid by Prime Minister Narendra Modi on 24 December 2016. Half of the project cost will be funded by the Centre and the State Government, while the remaining will be financed through loans from the AIIB and the World Bank. The Maharashtra Cabinet approved the Metro 4 corridor on 27 September 2016. Alstom awarded to provide rolling stock for this line, but the contract has been cancelled in March 2022 due to delays and uncertainties of the project. It will reduce the current travel time by between 50% and 75% depending on road conditions. Dedicated depots are planned in Owale land in up to an extent of 20 ha. It will provide rail based access to the commercial, government bodies and geographical landmarks in Mumbai. It is expected to be completed in 2022 and is expected to provide interconnectivity among the existing Eastern Express Highway, Central Railway, Mono Rail, the ongoing Metro Line 2B (D N Nagar to Mandale), and the proposed Metro Line 5 (Thane to Kalyan), Metro Line 6 (Swami Samarth Nagar to Vikhroli) and Metro Line 11 (Wadala to CSMT). Its construction was expected to begin by June 2018. The 32.32 km (20.08 mi) line is planned to be fully elevated, and is expected to consist of 32 stations from Wadala ( Mumbai) to Kasarvadavali ( Ghodbunder road, Thane) via Ghatkopar, Mulund and Teen Hath Naka, a popular traffic crossing in Thane. ![]()
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