▁buildings ▁built ▁post - 1 9 8 1 , ▁in ▁accord ance ▁with ▁the ▁new ▁building ▁codes , ▁with stood ▁the ▁earth qu ake ▁without ▁struct ural ▁damage . ▁ ▁W ig w ag - style ▁rail road ▁crossing ▁signals ▁were ▁de emed ▁in ade qu ate ▁in ▁ 1 9 4 9 ▁and ▁new ▁install ations ▁were ▁b anned ▁in ▁the ▁United ▁States . ▁Ex isting ▁w ig w ag ▁signals ▁were ▁allowed ▁to ▁remain ▁and ▁ 6 5 ▁years ▁later , ▁there ▁are ▁still ▁about ▁ 4 0 ▁w ig w ag ▁signals ▁in ▁use ▁on ▁rail ro ads ▁in ▁the ▁United ▁States . ▁ ▁The ▁UK ' s ▁national ▁rail ▁infrastr ucture ▁management ▁company ▁Network ▁Rail ▁requires ▁new ▁locomot ives ▁and ▁rolling ▁stock ▁to ▁pass ▁tests ▁for ▁elect romagnet ic ▁compatibility ▁( E MC ) ▁to ▁ensure ▁that ▁they ▁do ▁not ▁inter f ere ▁with ▁sign alling ▁equipment . ▁Some ▁old ▁dies el ▁locomot ives , ▁which ▁have ▁been ▁in ▁service ▁for ▁many ▁years ▁without ▁causing ▁such ▁inter ference , ▁are ▁ex empt ed ▁from ▁E MC ▁tests ▁and ▁are ▁said ▁to ▁have ▁acquired ▁grand father ▁rights . ▁ ▁The ▁Ste el ▁Electric - class ▁fer ry bo ats ▁used ▁by ▁Washington ▁State ▁Fer ries ▁were ▁in ▁viol ation ▁of ▁several ▁Coast ▁Guard ▁reg ulations , ▁but ▁because ▁they ▁were ▁built ▁in ▁ 1 9 2 7 , ▁before ▁the ▁en act ment ▁of ▁the ▁reg ulations , ▁they ▁were ▁allowed ▁to ▁sail . ▁Those ▁fer ries ▁were ▁de comm