supply of signal exchange lightsignal exchange light,signal exchange light - flashing led lamp (green and red) at outside of the drivers cab for excha nge of signal between driver/guard and the station master during train operation, it shall be conforming to rdso specification no. elrs/spec/pr/0022 latest, visibility at 2km in day and night, frequency of flashing 55-65 per mi nute, ip66 protection. the overall general arrangement shall be followed as per icf drg.no.889-7-2-007 latest sta nd suitable to vb rakes as per rdso specification no. rdso/pe/spec/emu/0196 2019 along with latest annexure and addendum/corrigendum [ warranty period: 30 months after the date of delivery ] ]