unction ▁Railway ▁station ▁at ▁Work ington ▁to ▁a ▁station ▁at ▁C ock erm outh ▁near ▁the ▁bridge ▁over ▁the ▁Der w ent . ▁A ▁single - track ed ▁line ▁of ▁eight ▁and ▁a ▁half ▁miles ▁length , ▁its ▁re venue ▁came ▁largely ▁from ▁the ▁transport ▁of ▁coal ▁from ▁the ▁p its ▁of ▁the ▁lower ▁Der w ent ▁valley ▁to ▁the ▁port ▁at ▁Work ington ▁for ▁ship ment ▁by ▁sea . ▁The ▁Mar ron ▁extension ▁of ▁the ▁White h aven , ▁Cle ator ▁and ▁Eg rem ont ▁Railway ▁and ▁the ▁Der w ent ▁Branch ▁of ▁the ▁Mary port ▁and ▁Carl is le ▁Railway ▁were ▁both ▁constructed ▁to ▁link ▁with ▁the ▁C & WR ▁and ▁together ▁give ▁an ▁alternative ▁route ▁for ▁the ▁north ward ▁movement ▁of ▁ha emat ite ▁ore ▁from ▁the ▁C umber land ▁ore - field . ▁ ▁The ▁completion ▁of ▁the ▁C ock erm outh , ▁K es wick ▁and ▁Pen r ith ▁Railway ▁made ▁the ▁C & WR ▁part ▁of ▁a ▁continuous ▁through ▁route ▁between ▁South ▁Dur ham ▁and ▁the ▁C umber land ▁or ef ield . ▁ ▁These ▁develop ments ▁both ▁improved ▁the ▁potential ▁profit ability ▁of ▁the ▁C & WR , ▁and ▁made ▁control ▁of ▁it ▁important ▁to ▁bigger ▁companies ▁wish ing ▁to ▁maxim ise ▁the ▁iron - ore ▁traffic ▁over ▁their ▁lines : ▁the ▁C & WR ▁was ▁absor bed ▁by ▁the ▁London ▁and ▁North ▁Western ▁Railway ▁in ▁ 1 8 6 6 . ▁ ▁Good s ▁traffic ▁on ▁the ▁line ▁ceased ▁in ▁ 1 9 6 4