The United Nations Educational, Scientific and Cultural Organization (UNESCO) have designated the Trans-Iranian Railway a World Heritage Site.

The designation was finalized during a Sunday meeting of UNESCO�s World Heritage Committee, according to a statement on the UN body�s website.

�The railway is notable for its scale and the engineering works it required to overcome steep routes and other difficulties,� read part of the statement on the listing.

The committee inscribed three other sites from China, India and Spain on its World Heritage List on Sunday.

The Trans-Iranian Railway is locally known as the Rah-Ahan Shomal-Jonub which literally translates as North-South Railway. It�was completed in 1938 after 11 years of construction which involved massive works on mountains and terrains up and down the country.