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Tamil Nadu's proposal to build South India's first interstate metro line between Bengaluru and Hosur has hit a major roadblock, as the Bangalore Metro Rail Corporation Limited (BMRCL) has declared it "technically not feasible." The issue lies in the difference between the electrical systems used by the two metros.
Karnataka Rejects the Interstate Metro Idea
Chennai Metro Rail Limited (CMRL) suggested connecting Hosur and Bommasandra using a 25 kV AC overhead traction system. At the same time, Namma Metro operates on a 750 V DC third rail system, making it impossible to create a single continuous line. BMRCL informed the Karnataka government that integration isn't technically possible, though Tamil Nadu still supports the project to boost Hosur's growth. However, Karnataka officials and citizens have opposed the idea, arguing it would mostly benefit Hosur and add pressure to Bengaluru's already strained infrastructure.
BMRCL's Opinions
If Tamil Nadu goes ahead and builds its line up to the Karnataka border, about 12 km from Hosur, the two metro systems may meet at Attibele. Two stations about 300 metres apart could be linked by a foot overbridge, the most practical solution, according to BMRCL officials.
BMRCL to Expand Bengaluru's Metro Network
Meanwhile, BMRCL is focusing on expanding the Bengaluru metro network under Phase 4. It is planning the Bommasandra-Attibele line (11 km, 7-8 stations), the Green Line extension from Madavara to Tumakuru (59.6 km, 25 stations), the southern Green Line extension from Silk Institute to Harohalli (24 km, 18 stations), and the Purple Line extension from Challaghatta to Bidadi (15 km, 13 stations). Moreover, studies are underway for three more extensions and one new 68-km corridor. These projects together aim to expand Namma Metro's total network to 467.69 km, nearly matching the size of the Delhi Metro network.
