The Union Cabinet on Thursday approved two rail projects covering Andhra Pradesh, Telangana and Bihar with a total estimated cost of Rs 6,798 crore, the government said. The Cabinet Committee on Economic Affairs, chaired by Prime Minister Narendra Modi, approved the doubling of the Narkatiaganj-Raxaul-Sitamarhi-Darbhanga and Sitamarhi-Muzaffarpur section in Bihar covering 256 km and construction of a new line between Errupalem and Namburu via Amaravati covering 57 km..