▁ 7 1 1 ▁complete ▁steam ▁locomot ives ▁and ▁finished ▁ 5 1 ▁which ▁were ▁comm enced ▁elsewhere . ▁There ▁were ▁ 3 2 ▁dies el ▁and ▁three ▁electric ▁locomot ives , ▁all ▁of ▁which ▁incorpor ated ▁parts ▁made ▁by ▁outside ▁contract ors . ▁ ▁Notes ▁ ▁References ▁▁▁▁ ▁Category : R ail way ▁work sh ops ▁in ▁Great ▁Britain ▁Railway ▁works , ▁Ash ford ▁Category : S outh ▁Eastern ▁Railway ▁( UK ) ▁Category : S outh ▁Eastern ▁and ▁Ch ath am ▁Railway ▁Category : Build ings ▁and ▁structures ▁in ▁Kent ▁Category : R ail way ▁dep ots ▁in ▁England <0x0A> </s> ▁Social ▁cycle ▁theories ▁are ▁among ▁the ▁earliest ▁social ▁theories ▁in ▁soci ology . ▁Un like ▁the ▁theory ▁of ▁social ▁evolution ism , ▁which ▁views ▁the ▁evolution ▁of ▁society ▁and ▁human ▁history ▁as ▁progress ing ▁in ▁some ▁new , ▁unique ▁direction ( s ), ▁soci ological ▁cycle ▁theory ▁arg ues ▁that ▁events ▁and ▁stages ▁of ▁society ▁and ▁history ▁generally ▁repeat ▁themselves ▁in ▁cycles . ▁Such ▁a ▁theory ▁does ▁not ▁necessarily ▁imply ▁that ▁there ▁cannot ▁be ▁any ▁social ▁progress . ▁In ▁the ▁early ▁theory ▁of ▁S ima ▁Q ian ▁and ▁the ▁more ▁recent ▁theories ▁of ▁long - term ▁(" sec ular ") ▁political - dem ographic ▁cycles ▁as ▁well ▁as ▁in ▁the ▁V arn ic ▁theory ▁of ▁P . R . ▁S ark ar ▁an ▁explicit ▁account ing ▁is ▁made ▁of ▁social ▁progress . ▁ ▁Historical ▁for er unn ers ▁Inter pret ation ▁of ▁history ▁as ▁repeating ▁cycles ▁of ▁Dark ▁and ▁Golden