▁to wers , ▁with ▁construction ▁adv ancing ▁rapidly ▁from ▁July ▁ 1 9 3 1 . ▁Car pent ers ▁built ▁wooden ▁sc aff old ing , ▁with ▁con cre ters ▁and ▁mas ons ▁then ▁setting ▁the ▁m ason ry ▁and ▁pour ing ▁the ▁concrete ▁behind ▁it . ▁G angers ▁built ▁the ▁steel work ▁in ▁the ▁to wers , ▁while ▁day ▁labour ers ▁manually ▁clean ed ▁the ▁gran ite ▁with ▁wire ▁br ush es . ▁The ▁last ▁stone ▁of ▁the ▁north - west ▁p yl on ▁was ▁set ▁in ▁place ▁on ▁ 1 5 ▁January ▁ 1 9 3 2 , ▁and ▁the ▁tim ber ▁to wers ▁used ▁to ▁support ▁the ▁c ran es ▁were ▁removed . ▁ ▁On ▁ 1 9 ▁January ▁ 1 9 3 2 , ▁the ▁first ▁test ▁train , ▁a ▁steam ▁locomot ive , ▁safely ▁crossed ▁the ▁bridge . ▁Load ▁testing ▁of ▁the ▁bridge ▁took ▁place ▁in ▁February ▁ 1 9 3 2 , ▁with ▁the ▁four ▁rail ▁tracks ▁being ▁loaded ▁with ▁as ▁many ▁as ▁ 9 6 ▁steam ▁locomot ives ▁position ed ▁end - to - end . ▁The ▁bridge ▁under w ent ▁testing ▁for ▁three ▁weeks , ▁after ▁which ▁it ▁was ▁declared ▁safe ▁and ▁ready ▁to ▁be ▁opened . ▁The ▁construction ▁work sh eds ▁were ▁demol ished ▁after ▁the ▁bridge ▁was ▁completed , ▁and ▁the ▁land ▁that ▁they ▁were ▁on ▁is ▁now ▁occupied ▁by ▁L una ▁Park . ▁ ▁The ▁standards ▁of ▁industrial ▁safety ▁during ▁construction ▁were ▁poor ▁by ▁today ' s ▁standards . ▁Six teen ▁workers