Just for reference, Wikipedia has a page on large transport projects that includes their cost.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;List_of_transport_megaprojects" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;List_of_transport_megaprojects</a>