Line 4 (Mumbai Metro)

The Maharashtra Cabinet approved the Metro 4 corridor on 27 September 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[4] and the World Bank.[5][6] The foundation stone for Metro 4 was laid by Prime Minister Narendra Modi on 24 December 2016.[7] The Maharashtra Coastal Zone Management Authority granted Coastal Regulation Zone (CRZ) to the project in February 2017. Over 1 km 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. 48 piers are proposed to built in the CRZ II. 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.[8]

The MMRDA utilized a drone to carry out survey work for Metro 4. The drones were fitted with 360 degrees camera that provide up to 3 millimeter accuracy. The aerial survey takes less time than a regular survey, achieves greater accuracy and helps protect against false claims for compensation.[9] 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 proposed 8 km extension is estimated to cost ₹300 crore per km.[10][11]

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 three flyovers will be built at Bhayander Pada, Kasarvadavli and Anandnagar near Ghodbunder.[12][13]

In May 2019, MMRDA Metropolitan Commissioner R.A. Rajeev announced a modified plan to use Siddharth Colony as the interchange station with Line 2. The original plan had proposed to use the Eastern Express Highway station on Line 2B and Siddharth Colony on Line 4 as the interchange stations. However, the two stations are approximately 480 metres away from Siddharth Colony and the change was made to simplify passenger transfers.[14]

A consortium of DB Engineering, Louis Berger and Hill International was awarded a project management and construction management services contract for the Metro 4 project in April 2018.[15][16] The MMRDA invited bids for civil work on the corridor on 4 January 2017.[17][18][19] The tenders for construction of viaducts and stations were divided into five packages - Wadala to Amar Mahal Junction, Garodia Nagar to Surya Nagar, Gandhi Nagar to Sonapur, Mulund Fire Station to Majiwada and Kapurbawdi to Kasarvadavali.[20][21] Metro 4 was tendered alongside Metro 2B. L&T, Afcons Infrastructure, Tata, NCC and JMC, Reliance Infrastructure-RdE, Wenig Incorporation, JKumar Group, ITD Cementation, CHEC-TPL bid for packages on both Metro 2B and Metro 4. A total of 11 firms and/or consortia submitted bids for the two lines, two of whom (Simplex Infrastructures and a consortium of GHEC-RCC-JV-China) bid exclusively for Metro 2B packages.[22][23]

The construction work was divided into five packages and awarded through the engineering, procurement and construction (EPC) model in April 2018. A joint venture between Reliance Infrastructure and Italian firm Astaldi S.p.A. was awarded three packages between Kasarwadavali and Wadala worth ₹1,584 crore (US$220 million).[24] The contract for the remaining two packages, worth a combined ₹1,048 crore (US$150 million), was awarded to a joint venture between Tata Projects Limited and China Harbour Engineering Company.[25] The civil work is expected to be completed in 30 months.[26][1]

Whereas, On the Metro 4A project, which is estimated to cost Rs 949 crore will have two stations Gowniwada and Gaimukh which is the extension Route.[27][28] The Mumbai Metropolitan Region Development Authority (MMRDA) has today issued two contract orders to major infrastructure company J Kumar Infraprojects Limited for construction of Mumbai Metro Line 4A (Kasarwadavali-Gaimukh corridor). Design and construction of elevated viaducts and two stations from Kasarwadavali to Gowinwada and Gowinwada to Gaimukh for the corridor of Mumbai Metro Line 4A (extension of Metro line 4 Wadala to Kasarwadavali of Mumbai Metro Rail Project of MMRDA). The total contract value of the letter of acceptance is Rs 342 crore.[29]

Current status

Sr. No.	Name of Work	Description	Status for year 2019 to 2021[36]
			21 May 2019	3 June 2019	14 June 2019	4 July 2019	6 August 2019	21 October 2019	29 November 2019	29 January 2020		8 September 2020	1 January 2021
1	Soil Investigation Works	Soil Investigation Work For Pier Foundation Completed	78%	80.5%		81.0%	82.0%	83.0%		85%	87%
2	Utility Works	Works Completed	64%	66.4%		68.2%		70%		71.36%	76%
3	Piling Works	Piling Work For Foundations Completed	17%	21.2%		22.7%	25.25%	33%	37%	42.56%	47%	55.15%	62.40%
4	Pile Cap Works	Pile Cap Work Completed	6.5%	10.1%		12.4%	14.7%	18.60%	21%	24.75%	27.3%	35.68%	44.85%
5	Pier Works	Piers Cast	3.5%	5.71%		8.0%	10.2%	15.70%	18.3%	29.23%	23.6%	29.29%	38.16%
6	Pier Cap Works	pier caps cast	Nil	Casting of Pier Cap is started at casting yard and 0.075% casting completed till May 2019.		Casting of Pier Cap is started at casting yard and 0.063% casting completed till June 2019	Casting of Pier Cap is started at casting yard and 0.068% casting completed till July 2019	6% Casting completed.	10%	17.98%	22%	28.99%	40.59%
		pier caps erected	Nil					0.80% Erection completed.	2.4%	23.34%	12%	23.81%	31.33%
7	U Girder Works	Casting yard works are in progress	Nil	Nil		Casting of U Girder started at casting yard and 0.21% casting completed till June 2019	Casting of U Girder started at casting yard and 0.41% casting completed till July 2019	2.33%	6%	11.83%	16%	20.09%	33.19%
		U Girder erected	Nil							0.9%	4%	15.69%	29.97%
8	Station work	Station work in progress	Nil	Pile Foundation works Started since last month								Works are in Progress	Works are in Progress.

Mumbai Metro 4 DreamLine

32 stations are being planned on Line 4. Most of them were either in the stage of planning or under early stages of construction (as of November 2018) [37]

The car depot will be located at Owale.[3]

2 stations are being planned on Line 4A. Connected to word Gaimukh to Kasarvadavali also connect Metro 10