Battery Operated Led Based Flashing Tail Lamp For Railway Vehicles, Confirming To Is Rd So Lko,S No.Rdso/Spn/200/2010 Revision : 2.0 (Draft) As Per Drg.No. Rdso/Spn/200/2010 Rev.(Draft) Specn: Rdso/Spn/200/2010 Rev. 2.0 (Draft) [ Warranty Period: 30 Months After The Date Of Delivery ] ]