Construction of cut & cover tunnel no. 1c (approx. length - 90m) at ch. 6.550 km to 6.640 km, c&c no. 2a (approx. length - 50m) at ch. 6.550 km to 6.640 km, balance works of c&c no. 1b (approx. length - 150m-rcc box) at ch. 6.750 km to 6.90 km, c&c no. a0 (approx. length - 145m) at ch. 0.772 km to 0.941 km and balance works of ug tunnel no. 1 (side drains, trolley refuges excavation & lining) at ch. 2.051km -3.932km, ug tunnel no. 1a (ug lining of approx. length 134m) at ch. 4.376 km to 4.510 km and ug tunnel no. 2 (ug lining of approx. length 460m) at ch. 7.123 km to 7.583 km including all related ancillary works, protection works, construction of side drains, etc in between stations bairabi and hortoki in connection with construction of new bg railway line bairabi-sairang(mizoram) .