Tenders for Supply of Dc-Dc Converter For Twin Beam Headlight For Electric Locomotive As Per Rdso Specification No. Elrs/Spec/ Dc-Dc Converter/0021 Rev.1 Sept-2004. Dc-Dc Converter For Twin Beam Headlight For Electric Locomotive As Per Rdso Specification No. Elrs/Spec/ Dc-Dc Converter/0021 Rev.1 Sept-2004 Warranty Perio D: 30 Months After The Date Of Delivery