Before World War Two, how did pipelines work for crude oil? What kind of metal or plastic were they made out of? What kind of sensors and monitoring did they need? Did they have "pigs" that travel up and down the pipe looking for problems? How were they kept warm so as not to freeze during winter?
The implication of information on war construction of the "Big Inch" and "Little Big Inch" pipelines from Texas to the East Coast of the US (at American Oil and Gas Historical Society is that there were not major long-distance pipelines before the war. Pictures at the indicated web site clearly show that the pipeline was welded steel. Buried 4 feet deep with moving product in it there was not an issue with freezing.