supply of secondary vertical damper for train-18,secondary vertical damper for train-18,,secondary vertical damper for train-18, emu us & memu us coaches to dr g. no.train18/mc/ac-0-5-010, item-1,alt-b and in compliance to rdso specification rdso/c g-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 (lat est revision) or en-13802. 3. service trials shall be as per rdso cg-18005 (latest revisi on) special condition : 1. proto type sample (including type test)to be got approved fro m icf before manufacturing for bulk supply. 2. the firms who have already supplied the same item need not get fresh prototype approval. [ warranty period: 72 months after th e date of delivery ]