- day ▁block ade ▁of ▁the ▁line ▁was ▁also ▁necessary , ▁during ▁which ▁track , ▁bridge , ▁and ▁station ▁modifications , ▁including ▁the ▁re building ▁of ▁the ▁platform ▁at ▁Haw k head ▁station , ▁were ▁performed . ▁ ▁During ▁November ▁ 2 0 1 2 , ▁it ▁was ▁announced ▁that ▁the ▁elect r ification ▁project ▁had ▁been ▁successfully ▁completed . ▁From ▁December ▁ 2 0 1 2 ▁on wards , ▁as ▁a ▁result ▁of ▁the ▁line ' s ▁elect r ification , ▁, ▁, ▁, ▁ ▁and ▁ ▁electric ▁multiple ▁units ▁have ▁been ▁used ▁to ▁operate ▁the ▁service . ▁Prior ▁to ▁this , ▁ ▁dies el ▁multiple ▁units ▁had ▁been ▁used ; ▁these ▁have ▁been ▁released ▁for ▁duties ▁elsewhere . ▁Since ▁the ▁route ' s ▁elect r ification , ▁fre ight ▁trains ▁can ▁only ▁traverse ▁the ▁line ▁with ▁the ▁overhead ▁w ires ▁de - ener g ised ▁( and ▁thus ▁must ▁be ▁dies el ), ▁as ▁a ▁result ▁of ▁the ▁minimum ▁wire ▁height ▁of ▁ 4 . 0 3 0 ▁metres ▁being ▁used ▁instead ▁of ▁the ▁standard ▁minimum ▁height ▁of ▁ 4 . 1 6 5 ▁metres ; ▁this ▁requirement ▁was ▁jud ged ▁to ▁be ▁ins ign ific ant ▁in ▁the ▁context ▁of ▁this ▁particular ▁line . ▁ ▁Future ▁The ▁re open ing ▁of ▁the ▁section ▁between ▁P ais ley ▁Canal ▁station ▁and ▁Kil mac ol m ▁has ▁been ▁proposed . ▁ ▁Con ne ctions ▁to ▁other ▁lines ▁ ▁Sh ield s ▁J unction ▁with ▁Glasgow ▁and ▁P ais ley ▁J oint ▁Railway