Question: Where does the section of railroad that is still used by Conway Scenic Railroad connect to the Maine Central Railroad?

 A section in New Hampshire remains in use by heritage railway Conway Scenic Railroad. The Mountain Division (later the Mountain Subdivision) is a railroad line that was once owned and operated by the Maine Central Railroad (MEC).  It stretches from Portland, Maine on the Atlantic Ocean, through the Western Maine Mountains and White Mountains of New Hampshire, ending at St. Johnsbury, Vermont in the Northeast Kingdom.  The line was abandoned in 1983 by MEC's successor, Guilford Transportation Industries (GTI).  Guilford retained a stub between Portland and Westbrook. <SEP> The Maine Central Railroad Company main line extended from Portland, Maine, east to the Canada–US border with New Brunswick at the Saint Croix-Vanceboro Railway Bridge.  It is the transportation artery linking Maine cities to the national railway network.  Sections of the main line had been built by predecessor railroads consolidated as the Maine Central in 1862 and extended to the Canada–US border in 1882.  Through the early 20th century, the main line was double track from South Portland to Royal Junction, where it split into a lower road through Brunswick and Augusta and a back road through Lewiston which converged at Waterville into single track to Bangor and points east.  Westbound trains typically used the lower road with lighter grades, while eastbound trains of empty cars used the back road.  This historical description does not include changes following purchase of the Maine Central Railroad by Guilford Transportation Industries in 1981 and subsequent operation as part of Pan Am Railways. <SEP> The Portsmouth, Great Falls and Conway Railroad (PGF&C) (later known as the Conway Branch of the Boston and Maine Railroad) is a former rail line between Rollinsford and Intervale, New Hampshire, in the United States.  At Rollinsford, the line connected to other lines to provide service between the White Mountains and coastal cities such as Boston.  At Intervale, it connected to the Mountain Division of the Maine Central Railroad.  The rail line takes its name from the city of Portsmouth, near its southern terminus; the city of Somersworth (formerly known as "Great Falls"); and the town of Conway, near its northern terminus.  Today, the infrastructure of the former PGF&C is owned by different entities, including the State of New Hampshire, the Conway Scenic Railroad, and the New Hampshire Northcoast Corporation.  Some segments are still operated as freight or heritage railways, while other segments are being maintained as rail trails. <SEP> The Portland & Ogdensburg Railroad was a railroad planned to connect Portland, Maine to Ogdensburg, New York.  The plan failed, and in 1880 the Vermont section was reorganized and leased by the Boston & Lowell Railroad.  In 1886, the Maine and New Hampshire section was reorganized as the Portland & Ogdensburg Railway.  That part was leased to the Maine Central Railroad in 1888, and in 1912 the Maine Central leased the eastern part of the Vermont section from the Boston & Maine Railroad, the successor to the B&L.