The Cooma Railway made a significant contribution to the development of the Monaro Region from the time of its construction 1887 - 89 .
The three timber viaducts were important items of the railway 's infrastructure .
The Cooma Railway made a significant contribution to the development of the Monaro Region from the time of its construction 1887 - 89 , and the three timber viaducts were important items of the railway 's infrastructure .