To carry out 4 Yearly Maintenance, cleaning and painting of 219.1MM OD GSPL & 355.6MM OD Mainline and its hanger units on river RAIDOK-II (RoW KM-640.2) & RAIDOK-I (RoW KM649.5) Rail Bridges. RAIDOK-II (GSPL & ML): Length:284 m, No. of hangers: (39+39) No.(RoW KM 640.2)