Running contract for Spring setting device ( Complete set of SSD ) to RDSO Drg. No. T- 6216 ( Alt- 5 ) with latest alterations if any, for use with Zu- 1- 60 Thick Web Curved Switch B. G ( 1673mm ) for 60 Kg. ( UIC ) PSC Sleeper as per specifications IRS: T- 54- 2021 for SSD for use with OR Curved Switch with latest amendment if any, as on opening of tender.