Patna Metro Rail Corporation (PMRC) is a planned rapid transit system for the City of Patna in Bihar, India. It will be constructed on Public Private Partnership (PPP) mode, estimated to cost Ã¢â€šÂ¹11545 crore (US$2 billion). On 14 September 2011, the Planning Commission of India gave approval for the Patna Metro. The Metro rail will be introduced on two routes under the public-private partnership mode. The metro rail in Patna is the second metro rail transport system in the total East India after the Kolkata Metro in the city of Kolkata.