8 ▁units ▁are ▁primarily ▁maintained ▁at ▁Bir ken head ▁North ▁T MD , ▁with ▁minor ▁maintenance ▁being ▁undert aken ▁at ▁Kirk dale ▁T MD . ▁The ▁units , ▁when ▁out ▁of ▁service , ▁have ▁st abling ▁points ▁at ▁various ▁sid ings ▁around ▁the ▁Mer sey ra il ▁network . ▁These ▁can ▁be ▁found ▁at ▁the ▁station ▁term ini ▁and ▁the ▁dep ots , ▁as ▁well ▁as ▁at ▁Rock ▁Fer ry ▁station ▁and ▁Bir ken head ▁North ▁station . ▁ ▁Past ▁operations ▁ ▁S out he astern ▁ ▁Con nex ▁South ▁Eastern ▁le ased ▁twelve ▁Class ▁ 5 0 8 s ▁fre ed ▁up ▁by ▁capacity ▁redu ctions ▁on ▁Mer sey ra il ▁services ▁in ▁ 1 9 9 6 ▁( 5 0 8 1 0 1 / 1 0 5 / 1 0 6 / 1 0 7 / 1 0 9 / 1 1 3 / 1 1 6 / 1 1 9 / 1 2 1 / 1 2 9 / 1 3 2 / 1 3 3 ), ▁for ▁operation ▁on ▁specific ▁Kent ▁services . ▁Their ▁main ▁duties ▁included ▁ ▁to ▁, ▁ ▁to ▁, ▁ ▁to ▁ ▁and ▁ ▁to ▁, ▁as ▁well ▁as ▁ ▁to ▁ ▁for ▁a ▁short ▁period . ▁Units ▁were ▁based ▁at ▁G illing ham ▁Dep ot . ▁ ▁In ▁September ▁ 2 0 0 6 ▁new ▁operator ▁S out he astern ▁announced ▁that ▁a ▁cas cade ▁of ▁rolling ▁stock ▁would ▁see ▁Class ▁ 4 6 6 ▁units ▁replace ▁the ▁ 5 0 8 s