supply of supply of signal exchange light.supply of signal exchange light.,signal exchange light - flashing led lamp (green and red) at outside of the drivers cab for exchang e of signal between driver/guard and the station master during train operation, it shall be conforming to rdso spec ification no. elrs/spec/pr/0022 latest, visibility at 2km in day and night, frequency of flashing 55-65 per minute, i p66 protection. the overall general management shall be followed as per icf drg.no.889-7-2-007 latest stand suita ble to vb rakes as per rdso specification no. rdso/pe/spec/emu/0196-2019 with materials [ warranty period: 3 0 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 la cs ] ] => limited