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m r a t e s as s i m i l a r work i s h e r e in c o n tr a c te d t o be pa id f o r ; and* i f such work i s not s im i l a r t o t h a t h e r e in c o n tr a c te d f o r , the C o n tr a c to r s h a l l submit in fo rm a t io n co n ce rn in g th e natu re o f th e same to th e E n gin eer b e f o r e such work i s commenced and i t s h a l l be c l a s s i f i e d as " e x t r a work" and paid f o r a t p r i c e s t o be agreed upon between th e E n gin eer and th e C o n t r a c to r , p r i o r to th e com­mencement o f th e same; b u t, i f th e C o n tr a c to r and th e E n gin eer a re unable to a g re e upon a p r i c e f o r such e x t r a work, th e R a ilr o a d Company may e n t e r i n t o a c o n t r a c t w ith any o th e r p a r t y o r p a r t i e s f o r i t s e x e c u t io n o r may i t s e l f perform any and a l l such e x t r a work th e same as i f t h i s c o n t r a c t had n e v e r e x i s t e d . In case the C o n tr a c to r does not p re s e n t a c la im i n w r i t i n g t o the E n gin eer on account o f the d i s s i m i l a r i t y i n th e work by rea son o f such change w it h i n te n days a f t e r such change has been e x p la in e d , th e Con­t r a c t o r s h a l l be f o r e v e r estopped from making any c la im t h e r e f o r . S e c t io n 10. TERMS OP PAYMENT The terms o f payment s h a l l be as f o l l o w s : During th e p r o g r e s s o f th e work th e E n gin eer s h a l l cause e s tim a te s t o be made 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 d u rin g each c a le n d a r month and about th e t w e n t ie t h day o f th e su cced in g month th e v a lu e o f th e same based on th e p r i c e or p r i c e s a f o r e s a i d , l e s s a r e s e r v e fund o f te n (IQ ) p e r c e n t, which s h a l l be h e ld by th e R a ilr o a d Company as s e c u r i t y f o r th e c o m p le tio n o f th e whole work in i t s s e v e r a l p a r t s , s h a l l be paid t o th e C o n t r a c to r and i f , a t th e tim e h e r e in s p e c i f i e d f o r th e com p le tio n o f th e work, each and e v e r y p a r t o f th e work has been done in accordance w ith th e p r o v i s i o n s h e r e o f and d e ­l i v e r e d up t o th e R a ilr o a d Company f r e e o f a l l cla im s and l i e n s and, i f th e C o n tr a c to r s h a l l have done and perform ed a l l th e covenants and u n d erta k in gs on th e p a r t o f th e C o n tr a c to r h e r e in mentioned t o be done and p erform ed , th e R a ilr o a d Company s h a l l , s u b je c t t o th e p r o v i s i o n s o f S e c t io n 11 he; r e o f , pay o v e r t o th e C o n tr a c to r a l l o f s a id r e s e r v e fund. S e c t io n 11. RESERVE FUND In th e ev en t t h a t th e bond g i v e n by the C o n tr a c to r as r e q u ir e d i n S e c t io n 4 h e r e o f i s i n s u f f i c i e n t , in th e o p in io n o f th e R a ilr o a d Company, t o p r o t e c t i t s i n t e r e s t , th e R a ilr o a d Company s h a l l not be o b l i g a t e d t o pay s a id r e s e r v e fund o f ten (10) p e r cent t o th e C o n tr a c to r im m ed ia tely upon th e c om p letio n o f th e work, but s h a l l have th e r i g h t , a t i t s o p t io n , t o r e t a i n such p o r t i o n o f s a id r e s e r v e fund as i t d e s i r e s u n t i l th e time a l l o t t e d by law f o r th e f i l i n g o f l i e n s upon o r a g a in s t th e work s h a l l have e x p ir e d , and u n t i l a l l l i e n s f i l e d upon o r a g a in s t th e work s h a l l have been f u l l y p a id . S e c t io n 12. ESTIMATES No e s tim a te s made under any o f th e f o r e g o i n g p r o v is io n s o f t h i s c o n t r a c t (e x c e p t th e '''F in a l" e s tim a te made upon th e term ­i n a t i o n o f th e C o n t r a c t o r 's work hereun der) s h a l l be construed or c o n s id e r e d as f i n a l or c o n c lu s iv e a g a in s t th e R a ilr o a d Company i n r e s p e c t t o th e amount o f work done and/or m a t e r ia ls fu r n is h e d , 5