Kolkata Metro Rail Corporation (KMRC), also known as East West Metro, is in charge of connecting the twin cities Kolkata and Howrah. The proposed metro rail route will be partly underground including the part that will be under the river Ganges. The 13.7 km route will have six station each in underground and elevated portions. The terminal stations will be Salt Lake Sector V and the Howrah Maidan.
References
Kolkata Metro Rail Corporation Wikipedia(Text) CC BY-SA