UP, Bihar, Jharkhand and West Bengal should come together and deregulate their labor market. The region is already connected by massive rivers. Expressways and Fast rail should be built to connect it further.
This region houses 32% of India and share a single river basin that would allow very rapid construction. Resources from Jharkhand can easily power the industries in the region.
The entire Indo-Gangetic plain can be turned into a massive assembly line, starting form Western UP and ending in the BoB.
DFC is a cool idea and will lead to growth of our nation, but if the nation want to be truly prosperous, it has bring large scale manufacturing to the Indo-Gangetic plains.