id ges ▁The ▁M WR , ▁though ▁only ▁ ▁long , ▁crossed ▁the ▁River ▁W ye ▁five ▁times , ▁and ▁the ▁River ▁I th on ▁once . ▁These ▁were ▁originally ▁built ▁with ▁lattice ▁gir der ▁sp ans ▁on ▁cast ▁iron ▁pill ars . ▁The ▁brid ges ▁were ▁built ▁at ▁the ▁W . ▁Thomas ▁Railway ▁Works ▁in ▁L lan id lo es . ▁Many ▁of ▁them ▁had ▁strong ▁plate ▁gir der ▁sp ans ▁installed ▁by ▁ 1 9 3 8 , ▁though ▁B ough ro od ▁had ▁lattice ▁g ird ers ▁until ▁the ▁line ▁was ▁closed . ▁The ▁iron ▁pill ars ▁were ▁enc ased ▁in ▁concrete ▁in ▁the ▁ 1 9 2 0 s ▁to ▁allow ▁heav ier ▁locomot ives ▁to ▁work ▁the ▁line . ▁ ▁Mid ▁Wales ▁Line ▁The ▁Wel sh ▁Rail ways ▁Through ▁Tra ffic ▁Act ▁of ▁ 1 8 8 9 ▁went ▁some ▁way ▁to ▁form alis ing ▁an ▁arrangement ▁to ▁create ▁the ▁Mid ▁Wales ▁Line , ▁to ▁form ▁part ▁of ▁a ▁through ▁route ▁from ▁South ▁Wales ▁to ▁Ch esh ire , ▁as ▁an ▁alternative ▁to ▁the ▁main ▁line ▁route ▁via ▁ ▁and ▁ ▁( i . e . ▁New port , ▁A berg aven ny ▁and ▁Here ford ▁Railway ▁plus ▁Sh rew s bury ▁and ▁Here ford ▁Railway ) ▁. ▁The ▁main ▁route ▁was ▁made ▁up ▁of ▁( N orth ▁to ▁South ): ▁ ▁Northern ▁fe eder ▁Great ▁Western ▁Railway : ▁O sw est ry ▁to ▁G ob ow en ▁for ▁the ▁Sh rew s bury ▁and ▁Ch ester ▁Railway