Complete soil exploration at bridge sites of Major Bridge No 65 71 75A 77 80 81 97A 111 112114 118 124 126 and 129 in Sakari Nirmali section and Major Bridge No 7A 21A 21B 21C and 36A in Jhanjharpur Laukabazar section in connection with gauge conversion of Sakari Nirmali and JhanjharpurLaukaha Bazar section.