I'm clicking on the last option, and it's not kind of a suggestion but a preference... it should first begin in all the packed suburban lines, mainly the South Line (MS-CGL), West Line (MAS-AJJ) followed by the other options mentioned in the poll.... cause these 2 lines r heavily packed in terms of many passengers traveling in that and it's high time they have a change in the trainset (although new EMUs r coming up)... this is under SR zone ONLY...ЁЯСНЁЯСН