Passage: Imperialist and entrepreneur Cecil Rhodes was instrumental in securing the southern states of the continent for the British Empire and envisioned a continuous "red line" of British dominions from north to south. A railway would be a critical element in this scheme to unify the possessions, facilitate governance, enable the military to move quickly to hot spots or conduct war, help settlement and enable intra- and extra-continental goods trade. The construction of this project presented a major technological challenge.

Question: What is one of the most important schemes that helps governments, military and settlement's economies?
A railway