▁nin ete enth ▁century ▁in ▁order ▁to ▁carry ▁the ▁V ale ▁of ▁G lam organ ▁Railway ▁between ▁Barry ▁and ▁Br id g end . ▁Const ruction ▁started ▁in ▁ 1 8 9 4 , ▁but ▁in ▁August ▁ 1 8 9 6 ▁pi ers ▁ 1 0 ▁and ▁ 1 1 ▁s ank ▁approximately ▁ 4 ▁feet ▁into ▁the ▁ground , ▁delay ing ▁construction . ▁The ▁bridge ▁was ▁opened ▁on ▁ 1 ▁December ▁ 1 8 9 7 , ▁but ▁closed ▁within ▁a ▁few ▁days ▁when ▁one ▁of ▁the ▁emb ank ments ▁began ▁to ▁give ▁way . ▁A ▁two ▁and ▁a ▁half ▁mile ▁loop ▁line ▁di version ▁was ▁quickly ▁built ▁around ▁the ▁north ▁of ▁the ▁valley , ▁whilst ▁rep airs ▁and ▁under pin ning ▁were ▁entr usted ▁to ▁Price ▁and ▁Will s , ▁build ers ▁of ▁the ▁no . ▁ 2 ▁dock ▁in ▁Barry . ▁The ▁vi ad uct ▁eventually ▁re - open ed ▁on ▁ 8 ▁January ▁ 1 9 0 0 . ▁ ▁The ▁vi ad uct ▁has ▁six teen ▁arch es ▁which ▁vary ▁between ▁ 4 5 ▁and ▁ 5 0 ▁feet ▁( 1 5 ▁metres ) ▁in ▁width ▁and ▁rising ▁to ▁a ▁height ▁of ▁ 1 1 0 ▁feet ▁( 3 3 ▁metres ) ▁and ▁now ad ays ▁sp ans ▁across ▁P orth ker ry ▁Park . ▁It ▁became ▁Gra de ▁II ▁listed ▁in ▁ 1 9 6 3 . ▁ ▁Origin ally ▁designed ▁as ▁a ▁route ▁to ▁bring ▁coal ▁to ▁Barry ▁D ock s , ▁the ▁railway ▁now