Built as the Portland & Ogdensburg Railroad before acquisition by the Maine Central Railroad (MEC), the line initially provided transportation for summer visitors to grand Victorian hotels, including the Bay of Naples Inn in Naples (reached by connection with Sebago Lake steamboats), the Crawford House in Crawford Notch, and the Mount Washington Hotel in Bretton Woods. Cool, clean air at Sebago Lake and the White Mountains provided a refreshing escape from the heat, humidity and smoke of 19th-century cities. Autumn foliage and winter skiing extended the tourist season. The Flying Yankee train-set operated as the Mountaineer from Boston to Crawford Notch via Intervale Junction during World War II, but passenger service had been reduced to a single daily round-trip between Portland and St. Johnsbury by the 1930s. The train between Portland and St. Johnsbury usually consisted of a RPO-express car, a baggage car and a single coach after the 1920s; and substitution of a stainless steel combination for the coach and baggage car reduced the train to two cars for the last several years before the end of passenger service in 1958.