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B compensation t o be a llo w e d t h e r e f o r or payments made, but a l l such e s tim a te s made b e f o r e the f i n a l e s tim a te s h a l l be construed and c o n s id e re d t o be a l t o g e t h e r approximate and p r o v i s i o n a l and s u b je c t t o adju stm en t, rea d ju stm en t, r e v i s i o n and c o r r e c t i o n as th e E n gin eer may t h e r e a f t e r d e te rm in e; and th e R a ilr o a d Company h ereby r e s e r v e s th e r i g h t , upon th e com p letio n o f th e work and p r i o r t o th e making o f th e f i n a l c e r t i f i c a t e , t o a d ju s t , r e a d j u s t , r e v i s e and c o r r e c t any and a l l o f s a id approximate e s tim a te s f o r th e d e te rm in a t io n o f th e amount o f work done and/or m a t e r ia ls fu r n is h e d under t h i s c o n t r a c t , o f amounts p a id , o f th e amount o f work u n fin is h e d and/or th e amount o f m a t e r ia ls u n fu rn ish ed , and th e v a lu e s t h e r e o f r e s p e c t i v e l y , as w e l l as th e amount o f compen­s a t i o n t h e r e f o r ; h a vin g r e f e r e n c e t o th e uncompleted p a r t of, sa id work and/or unfu rnished p a r t o f s a id m a t e r i a l s , as w e l l as t o the work done or m a t e r ia ls fu r n is h e d . S e c t io n 13. PROSECUTION OF WORK: FORFEITURE I f th e C o n t r a c to r s h a l l f a i l t o p r o s e c u te th e work w ith a f o r c e s u f f i c i e n t , in th e o p in io n o f th e E n g in e e r, t o in s u re i t s com p letio n w it h i n th e tim e h e r e in s p e c i f i e d or i f , i n th e o p in io n o f th e E n g in e e r, th e c h a r a c t e r o f th e work i s not in accordance w ith th e p r o v i s i o n s h e r e o f , th e E n gin eer s h a l l have th e o p tio n to s e r v e w r i t t e n n o t i c e on th e C o n tr a c to r t o su pp ly at once the n e c e s s a r y in c r e a s e o f f o r c e , a p p lia n c e s , dr t o o l s , o r t o cause such improvements in th e c h a r a c t e r o f th e work and/or m a t e r ia ls as may be r e q u ir e d t o make th e same conform t o th e s t i p u l a t i o n s o f t h i s c o n t r a c t and i f , on th e e x p i r a t i o n o f days a f t e r th e s e r v i c e o f such w r i t t e n n o t i c e upon the C o n tr a c to r by s e r v in g same on th e C o n t r a c to r , or an o f f i c e r o f th e C o n t r a c to r , o r on th e r e p r e s e n t a t i v e o f th e C o n tr a c to r i n charge o f th e work, in any case p e r s o n a l l y o r by m a il, th e C o n tr a c to r s h a l l have f a i l e d t o comply w ith th e req u irem en ts o f such n o t i c e , th e E n gin eer s h a l l , a t h is o p t io n , have f u l l power t o su pp ly such a d d i t i o n a l f o r c e , a p p lia n c e s or t o o l s as he may deem r e q u i s i t e and n e c e s s a ry t o com plete the work i n th e tim e s p e c i f i e d , t o make o r have made such improvements in th e c h a r a c t e r o f th e work and/or m a t e r ia ls as may be r e q u ir e d t o conform t o th e p r o v i s i o n s o f t h i s c o n t r a c t , t o pay f o r a l l la b o r so employed and m a t e r ia ls and o th e r e x ­penses so used o r in c u r r e d and t o deduct th e amounts so pa id from any payments then due o r t h e r e a f t e r f a l l i n g due t o th e C o n tr a c to r h ereu n der; o r , i n th e case o f th e f a i l u r e o f th e C o n tr a c to r t o comply w ith such w r i t t e n n o t i c e w it h i n days a f t e r the s e r v i c e t h e r e o f as a f o r e s a i d , th e E n g in e e r, a t fin er e x p i r a t i o n o f such days, a t h is o p t io n , may d e c l a r e t h i s c o n tr a c t f o r f e i t e d and a&m® doned and tak e p o s s e s s io n o f th e work im m ed ia tely t o th e e x c lu s io n o f th e C o n t r a c to r , and th e C o n tr a c to r s h a l l have no f u r t h e r r i g h t s under t h i s c o n t r a c t a f t e r such d e c l a r a t i o n o f f o r f e i t u r e and thereupon no f u r t h e r payments s h a l l be made by the R a ilr o a d Com­pany t o th e C o n t r a c to r under t h i s c o n t r a c t but th e d i f f e r e n c e between th e amount due th e C o n tr a c to r and th e amounts a c t u a l l y pa id t o the C o n tr a c to r p r i o r t o th e tim e o f s a id f o r f e i t u r e s h a l l be used by th e R a i l r o a d Company, so f a r as n e c e s s a r y , t o compen-