I use the word “revert” because prior to 1977, all oil exports to Great Lakes countries were done by Ugandan oil companies from Kampala. Block trains from Mombasa oil terminals would haul petroleum products to Kampala, Jinja and Kasese oil depots where exports to Rwanda, Eastern DRC, and South Sudan were loaded.
Then in mid-1977 the East African Community (EAC) collapsed and with it the regional railways and lake transport systems. As EAC countries shared the railway assets, deliveries of oil to export markets could not be guaranteed.