Railway reserves the right to purchase Bulk Quantity from those sources who have been approved by RDSO for the item '' Screw couplings (Including Spares)'' (RDSO Item ID: 3100312 , RDSO SUB Item ID: 3100312001 Screw coupling for Coaching stocks) or it's authorized dealer on or before the date of tender opening. But in case of removal or suspension or banning or degradation after opening the tender, such cases will be taken into account while deciding tender ( for details regarding ordering on Approved / Developmental vendors please refer para 3.1 to 3.3 of Part B Southern Railway tender conditions). As per Railway Board letter No.2021/RS(G)/779/71 dt.09/05/2025, It is clarified that Railway units, other than the concerned nominated vendor approving agencies, are permitted only to place orders either on developmental vendors or approved vendors, for the items which are restricted to be procured from vendors listed on UVAM. No orders can be placed by Railway Units, other than nominated vendor approving agencies, on vendors who are not Developmental Vendors or Approved Vendors. Developmental Vendors are only such vendors which are listed as developmental vendors on UVAM without any condition.