corrigendum : supply of plastic cover for 2 aspect signal unit cover , plastic cover for 2 aspect signal unit cover opened from front side and botto m side and made of black polythene sheet of 200 micron thickness. size 1200 mm x 460 mm x 2 05 mm on back side 75 mm wide corner to corner diagonal cross mark of white color paint to be provided. to tie up cover with signal unit suitable nylon rope of 5 mm dia and 4 mtr le ngth to be provided on front side and of 1.5 mtr length at center. as per drg rst-12075. (sa mple to get approved before bulk supply) ] , plastic cover for route body opened from front side and made of plastic sheet of 200 micron t hickness of size 685 x 76 mm round shape and in back side 50 mm, 100 micron thickness white colour cr oss mark 0.5 mm dia nylon rope to be provided on front side to tie up . ] , plastic cover for route arm open from front side and bottom side made of black plastic sheet of 200 micron thickness size :-670 mm x 530 mm x 86 mm . on back side 50 m m wide corner to corner diagonal cross mark to be painted with white colour covering th e entire back side. 5 mm dia nylon rope to be provided on front side to tie up. (sample to get approved before bulk supply) ]