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s h a l l be made u nless a c la im t h e r e f o r i s p r e s e n te d i n w r i t i n g t o th e E n gin eer w it h in a r e a s o n a b le tim e a f t e r th e occu rren ce o f such d e la y . S e c t io n 16. RIGHT TO STOP WORK I t i s h ereb y m u tu a lly covenanted and agreed th a t w henever, i n th e o p in io n o f th e R a ilr o a d Company, i t s h a l l be n e c e s s a ry or e x p e d ie n t t o s to p th e work o r any p o r t i o n t h e r e o f , or t h a t th e f o r c e employed th e r e o n should be d im in is h ed , the R a ilr o a d Company s h a l l have th e r i g h t and power t o s to p th e work or d im in is h s a id f o r c e and th e C o n tr a c to r s h a l l have no c la im f o r damage by reason t h e r e o f . The o r d e r t o stop the work s h a l l be made i n w r i t i n g , sig n ed by the E n gin eer and d e l i v e r e d t o th e C o n t r a c t o r , o r in th e case o f th e C o n t r a c t o r ’ s absence t o some person on the, work r e p r e s e n t in g th e C o n t r a c to r , a t l e a s t days p r i o r t o th e d a te when such o r d e r s h a l l tak e e f f e c t . S e c t io n 17. SUSPENSION OF WORK FOR OVER THIRTY DAYS, I t i s f u r t h e r agreed t h a t in case o f a t o t a l suspension o f work under t h i s c o n t r a c t a r i s i n g from no f a u l t , f a i l u r e or c o l l u s i o n on th e p a r t o f th e C o n tr a c to r and c o n tin u in g f o r a lo n g e r p e r io d than t h i r t y ( 3 0 ) days, u n less such su spension s h a l l have been caused by unusual w eather c o n d i t i o n s , o r i n ca se th e f o r c e employed on th e work should be d im in ish ed f o r a lo n g e r p e r io d than t h i r t y days i n accordance w ith i n s t r u c t i o n s o f th e E n g in e e r, th e E n gin eer s h a l l make f i n a l e s tim a te o f th e amount and v a lu e o f a l l work done and m a t e r ia ls fu r n is h e d a c c o rd in g t o th e terms o f t h i s c o n t r a c t , and th e amount then found t o be due, t o g e t h e r w ith a l l r e t a i n e d p e r c e n ta g e s , ex c e p t as h e r e in o t h e r ­w is e p r o v id e d , s h a l l be p a id t o th e C o n t r a c to r . S e c t io n 18. FEDERAL AND STATE LAWS - LIENS The C o n t r a c to r s h a l l pay th e wages and s a l a r i e s o f th e o f f i c e r s , agents and employees o f th e C o n tr a c to r in s t r i c t accordance w ith F e d e r a l enactments and w ith th e laws o f the s t a t e i n which the work i s perform ed , and s h a l l in d em n ify and h o ld harmless th e R a ilr o a d Company and tms. xanm jm m t v takw U n iS t t Company, L e s s o r o f th e R a ilr o a d Company p a r t y h e r e t o ( h e r e i n a f t e r c a l l e d "L e s s o r Company"), from and a g a in s t a l l damages, p e n a l t i e s and expenses o f w h atsoever natu re r e s u l t i n g from f a i l u r e so t o do. The C o n tr a c to r s h a l l comply w ith th e laws o f the s t a t e in which th e work i s perform ed r e g a r d in g l i e n s f o r la b o r , m a t e r ia l and s u p p lie s fu r n is h e d f o r th e work and s h a l l p r o t e c t and in d em n ify th e R a ilr o a d Company and th e L e s s o r Company from and a g a in s t any and a l l cla im s or l i e n s a g a in s t th e work f o r la b o r , m a t e r i a l o r s u p p lie s fu r n is h e d th e Con­t r a c t o r ; and th e R a ilr o a d Company may, whenever i t deems i t p ro p e r or e x p e d ie n t so t o do, pay t o th e l a b o r e r s o r o th e r p erson s employed by th e C o n t r a c to r , o r th o s e who may have