Question 1

When will Mumbai Metro Line 4 open?

Accepted Answer

MMRDA has announced no opening date. News reports of August and September 2026 say MMRDA aims to open the first stretch, Cadbury Junction to Gaimukh, around Diwali or by the end of 2026, once the safety approvals are in. The site counts down to 31 Dec 2026 as a reported target. Trial runs on this stretch began in September 2025, and the safety commissioner's report on the Gaimukh pit line is awaited. Earlier targets of December 2025 and April 2026 have passed. For the rest of the line, the reported targets are October 2026 to Gandhi Nagar, October 2027 to Wadala; the first of these has passed.

Question 2

Which stretch of Line 4 opens first?

Accepted Answer

Cadbury Junction to Gaimukh, about 10.5 km at the Thane end, with Line 4A. It has 10 stations: Cadbury Junction, Majiwada, Kapurbawdi, Manpada, Tikuji-Ni-Wadi, Dongari Pada, Vijay Garden and Kasarvadavali on Line 4, and Gowniwada and Gaimukh on Line 4A. A report of August 2026, quoting an MMRDA official, names only 8 of them, without Manpada and Gowniwada; no source says whether those two open with the rest. Next, as reported in September 2025: Mahapalika Marg to Gandhi Nagar, with 11 stations, then Surya Nagar to Bhakti Park (Wadala), with 11. MMRDA itself names no phases.

Question 3

How much of Line 4 is built?

Accepted Answer

MMRDA's progress table for 31 Aug 2026 covers the whole line and puts each civil activity at 92% to 98%: pier (viaduct and station, up to platform level) 95%, pier cap erection 98%, U-girder erection 94%, I-girder erection 97%, deck slab 92%, L-girder erection 96%, T-girder erection 98%, RCC beam erection 97%, portal beam erection 93%. MMRDA publishes no figure by station or by stretch. The first stretch, Gaimukh to Cadbury Junction, is built and in trial runs; RDSO certified it on 2 Jun 2026, as reported.

Question 4

What is the route of Metro Line 4?

Accepted Answer

Wadala (Bhakti Park) to Kasarvadavali, via Ghatkopar, Vikhroli, Bhandup, Mulund and Thane; Line 4A continues to Gaimukh. Line 4 is 32.32 km long, fully elevated, with 30 stations; with Line 4A, MMRDA gives 35.2 km. The 2016 project report runs it along the Eastern Express Highway from Wadala to Mulund, then through Thane on Lal Bahadur Shastri Marg and Ghodbunder Road.

Question 5

Which stations are on Line 4?

Accepted Answer

30 on Line 4, in order from Wadala: Bhakti Park Metro, Wadala TT, Anik Nagar Bus Depot, Siddharth Colony, Garodia Nagar, Pant Nagar, Laxmi Nagar, Shreyas Cinema, Godrej Company, Vikhroli Metro, Surya Nagar, Gandhi Nagar, Naval Housing, Bhandup Mahapalika, Bhandup Metro, Shangrila, Sonapur, Mulund Fire Station, Mulund Naka, Thane Teen Haath Naka, RTO Thane, Mahapalika Marg, Cadbury Junction, Majiwada, Kapurbawdi, Manpada, Tikuji-Ni-Wadi, Dongari Pada, Vijay Garden, Kasarvadavali. Line 4A adds Gowniwada and Gaimukh. The 2016 plan also had Suman Nagar and Amar Mahal Junction; both were dropped in Dec 2023, for cost and lack of space, as reported.

Question 6

What is Line 4A?

Accepted Answer

The extension of Line 4 from Kasarvadavali to Gaimukh, with Gowniwada and Gaimukh stations. Sources differ on its length: 2.88 km from MMRDA's figures of 2023, 2.668 km in the 2017 project report, 2.7 km in trade press. Its cost is reported as Rs 949 crore (Rs 940 crore in the 2017 report). J Kumar holds its civil contract (package CA-54, Rs 342 crore, Sep 2019). It is part of the first stretch to open, as reported.

Question 7

Where does Line 4 meet other lines?

Accepted Answer

At Bhakti Park Metro, with Mumbai Monorail, at Bhakti Park. At Gandhi Nagar, with Metro Line 6 (Swami Samarth Nagar-Vikhroli), at Kanjur Marg (W). At Kapurbawdi, with Metro Line 5 (Thane-Bhiwandi-Kalyan). Planned or reported: at Siddharth Colony, Metro Line 2B (D N Nagar-Mandale), at EEH; at Anik Nagar Bus Depot, Metro Line 11 (Wadala-Gateway of India), proposed; at Dongari Pada, the Thane Integral Ring Metro (Maha-Metro), at its Dongripada station, 186 m away; at Gaimukh, Metro Line 10 (Gaimukh-Mira Road), approved. MMRDA also names a connection with the Central Railway, but no source names the Line 4 station for it.

Question 8

How much does Metro Line 4 cost?

Accepted Answer

MMRDA gives a base cost of Rs 14,549 crore for Line 4, including taxes and duties. With Line 4A's reported Rs 949 crore, that makes Rs 15,498 crore. The 2016 project report had Rs 11,115 crore at March 2016 prices. Germany's KfW lends EUR 545 million for the systems of Lines 4 and 4A, the trains and ticketing among them; MMRDA pays the rest.

Question 9

Who is building Line 4?

Accepted Answer

MMRDA (Mumbai Metropolitan Region Development Authority) is building the line. On 3 Mar 2018 it gave the viaduct and stations to two joint ventures: Reliance Infrastructure and Astaldi (packages CA-08, CA-10 and CA-12) and Tata Projects and CHEC (CA-09 and CA-11). L&T holds the systems contract, with Alstom for the trains (CA-234), and the power and traction contract from Wadala to Cadbury Junction (CA-298).

Question 10

Where is the Line 4 depot?

Accepted Answer

At Mogharpada, Thane, on 41.5 hectares, shared with Lines 4A, 10 and 11. SEW Infrastructure and Vishwa Samudra Engineering hold its contract (package CA-160). The depot was not ready for the first stretch, so a pit line at Gaimukh serves it for now: two island platforms and four tracks. The safety commissioner inspected the pit line in August 2026.

Question 11

Which trains will run on Line 4?

Accepted Answer

Alstom is building 39 driverless 6-car Metropolis trains for Lines 4 and 4A, through L&T's systems contract (package CA-234), which also covers the signalling and platform screen doors. The first was unveiled at Alstom's factory at Sri City on 14 Oct 2026, built in 14 months; delivery to Mumbai is expected in December 2026. The first trial runs used two trains borrowed from Line 2A. An earlier order, for 234 cars from Bombardier, was cancelled in 2022.

Question 12

How many people will use Line 4?

Accepted Answer

About 12.13 lakh riders a day by 2031, as projected. MMRDA says the line cuts travel time by 50% to 75%, depending on road conditions.

Question 13

What else is Metro Line 4 called?

Accepted Answer

Mumbai Metro Line 4 is also called Metro 4, the Green Line or the Wadala-Ghatkopar-Mulund-Thane-Kasarvadavali Metro. MMRDA gives its colour as the Green Line.