Read it through once

A telegraph line stretches straight up north through that 2,000 miles of wilderness and desert from Adelaide to Port Darwin on the edge of the upper ocean. South Australia built the line; and did it in 1871-2 when her population numbered only 185,000. It was a great work; for there were no roads, no paths; 1,300 miles of the route had been traversed but once before by white men; provisions, wire, and poles had to be carried over immense stretches of desert; wells had to be dug along the route to supply the men and cattle with water.