Bengaluru: Namma Metro's Phase 3A will feature underground stations 40 metres shorter than planned after authorities slashed the overall estimated cost by Rs 2,920 crore, according to two senior officials with direct knowledge of the matter.

Also called the Red Line, this 36.59-km corridor will connect Sarjapur in the southeast to Hebbal in the north via the CBD. Its tentative deadline is 2031.

In December 2024, the Karnataka cabinet approved Phase 3A’s Detailed Project Report (DPR), which had estimated the overall cost at Rs 28,405 crore, or Rs 776.3 crore per km, the most expensive in Namma Metro's history.

However, when the DPR was sent to the Ministry of Housing and Urban Affairs (MoHUA) for approval, it found the cost \"significantly higher\" than benchmark norms.

The DPR had base

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