Oil processing for me is no different than a line of stone furnace smelting. My initial oil refineries are along side my red green science build. I just run a pipe all the way across the map to the closest oil source. Even at great distances a pipeline would handle 8000% oil field which is more than enough to last until you get to megabase stages. I also run the first 8 belts to the closest iron, copper, and coal patch in the same manner.

I’ve done a LOT of hustling with trains and have found that they would be better suited as a yellow science tech than a green science tech. I don’t add trains until after I get power armor mk2 and logistics up and running. I could go into depth as to why if you’d like but don’t feel that is appropriate here in this thread.