The government of Japan has committed Rs 7,084 crore to India for three infrastructure projects, including Patna metro rail.

These include Patna metro rail project (around Rs 5,509 crore), a project for forest and biodiversity conservation for climate change response in West Bengal (approx. Rs 520 crore) and Rajasthan Water Sector Livelihood Improvement Project (RWSLIP) (about Rs 1,055 crore).

The Patna metro rail project is constructing the new Metro Corridor-I and II. The lowering work of the first-ever tunnel boring machine (TBM) segment for Corridor-II (Patna Junction-Patliputra Bus Terminal) has been started for the laying of an underground network.

The estimated time to compete the underground tunnel is 30 months.