PRIMARY VERTICAL DAMPER FOR TRAIN- 18 COACHES TO DRG. NO. TRAIN18/ MC/ AC- 0- 1- 009, ITEM- 1, ALT ' b '--- AND IN COMPLIANCE TO RDSO specification RDSO/ CG- 18005---- OR EN- 13802 ( LATEST REVISION ). 1. FIRM HAS TO SUBMIT OEM DRAWINGS WITH DETAILED DIMENSIONS & CHARACTERISTICS. 2. TYPE TEST SHALL BE CONFORMING TO RDSO CG- 18005 ( LATEST REVISION ) OR EN13802. 3. SERVICE TRIALS SHALL BE AS PER RDSO CG- 18005 ( LATEST REVISION )