Tender For supply of supply and fitment of compressed air pipeline arrangement at yard ngc detailed description as per item 1 of the attached specification document , railing at body end side of 25 mm dia for boggie hopper wagon type as per rdso s drawing no-wd-96021-s-02 , railing at door operating side of 25 mm bogie hopper wagon type as per rdso drawing no-sk 77542 item no- 2, alt 1,2,34, 5 and 6 ref drg no wd-88005 , supply and fitment of air pressure control unit the detailed description as per item 4 of the attached specification document , silico manganese steel sheet thickness-3 mm, size -8x 4 feet spec- is3885 part-1 grade 4 silico manganese steel