By Kavita Mistry 
The Mumbai Metropolitan Region Development Authority (MMRDA) has started trial runs on Metro Lines 4 and 4A, marking a critical step forward in improving the city’s public transport network. The trials cover a 10-kilometre stretch from Cadbury Junction to Gaimukh, a move expected to enhance travel for thousands of commuters in the city’s eastern corridor.
What Are Lines 4 and 4A?
- Line 4: Runs 32.32 km from Wadala to Kasarvadavali, featuring 30 stations.
- Line 4A: A 2.7 km extension from Kasarvadavali to Gaimukh.
Together, they form a vital link for East Mumbai, aiming to cut travel times by 50–75% and ease heavy traffic. These lines will also connect with several other metro corridors, creating a seamless, interconnected urban transit system.
Speeding Up Despite Challenges
While the final depot for these lines is still under construction, MMRDA has created a temporary setup with inspection pits at Gaimukh to begin early operations. This shows the agency’s commitment to getting the system running without delays.
The trial phase includes rigorous testing:
- Load and traction performance
- Signaling systems
- Emergency drills
These checks ensure passenger safety and system reliability before full public launch.
Why This Metro Line Matters
Metro Lines 4 and 4A aren’t just about faster commutes—they represent a shift toward sustainable city planning. With increasing traffic and pollution, these lines offer:
- A greener alternative to road travel
- Reduced carbon emissions
- Better connectivity across Mumbai suburbs
Their integration is aligned with the vision of a zero-net-carbon, commuter-friendly city.
Looking Ahead
As trials continue, MMRDA is focused on resolving any technical snags and aligning with long-term transport goals. Once operational, Metro 4 and 4A will reshape commuting in East Mumbai, offering a faster, cleaner, and more reliable way to get around.
These lines also set the tone for future metro developments in India—sustainable, scalable, and commuter-first.