The Maine Central was at its height by 1917 when it became nationalized during World War I under the United States Railroad Administration, having trackage which extended over 1,358 miles. It ran from Vanceboro, Calais and Eastport in the east, to Portland in the south, St. Johnsbury in the west, and to Lime Ridge, Quebec in the north. It also operated resorts and coastal steamships and ferries.