India's metro boom: From one city to a network set to overtake the US

India's metro network has undergone a remarkable transformation in recent years, evolving from a single line in Kolkata in 1984 to a sprawling system servicing 26 cities. As of September 5, 2025, India's metro network spans approximately 1,170 kilometers, just 216 kilometers shy of overtaking the United States as the second-longest metro network globally, following China's extensive infrastructure.

The journey to this milestone has been swift and ambitious. By 2025, the operational metro network had already surpassed 1,000 kilometers, extending to 26 cities nationwide. This rapid expansion has been driven by a surge in construction rates, which surged from 0.68 kilometers per month before 2014 to nearly 6 kilometers per month in the subsequent period.

The government has sanctioned 38 metro projects totalling 1,051 kilometers, with an annual allocation of around Rs 30,942 crore earmarked for metro infrastructure in 2026-27.

India's metro expansion has not been limited to the traditional megacities. Cities such as Lucknow, Jaipur, Kochi, Ahmedabad, Nagpur, Pune, Kanpur, Agra, Bhopal, and Indore have joined the metro network, with Bhopal becoming the 26th city to inaugurate an operational metro service in December 2025. The success of Delhi's metro system, which now spans 374 kilometers, has served as a model for other urban centers.

While India's metro network is still heavily concentrated in major urban clusters, the next phase of expansion promises to bring this infrastructure to more cities. Current projects include the ongoing construction of 886 kilometers of metro lines across 30 projects, with major developments in Delhi Metro Phase IV, Chennai Metro Phase II, Bengaluru's Phase II, Mumbai, Pune, and Nagpur systems, and the first full network for Surat.

Tier-II cities like Bhopal, Indore, Agra, Patna, and Kanpur are also actively expanding their metro networks.

Despite the 216-kilometer gap remaining between India's and the United States' metro networks, the rapid pace of construction in India suggests that this gap may be closed in the coming years. However, the exact size of India's metro network by 2030 will depend on the timely completion of ongoing projects and new approvals, which may be influenced by factors such as land acquisition, financing, and implementation challenges.