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

<P0-S0> 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. <P0-S1>  At Rollinsford, the line connected to other lines to provide service between the White Mountains and coastal cities such as Boston. <P0-S2>  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. <P0-S3>  At Intervale, it connected to the Mountain Division of the Maine Central Railroad. <P0-S4>  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. <P0-S5>  Some segments are still operated as freight or heritage railways, while other segments are being maintained as rail trails. <SEP> <P1-S0> The Portland & Ogdensburg Railroad was a railroad planned to connect Portland, Maine to Ogdensburg, New York. <P1-S1>  The plan failed, and in 1880 the Vermont section was reorganized and leased by the Boston & Lowell Railroad. <P1-S2>  In 1886, the Maine and New Hampshire section was reorganized as the Portland & Ogdensburg Railway. <P1-S3>  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. <SEP> <P2-S0> 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. <P2-S1>  It is the transportation artery linking Maine cities to the national railway network. <P2-S2>  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. <P2-S3>  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. <P2-S4>  Westbound trains typically used the lower road with lighter grades, while eastbound trains of empty cars used the back road. <P2-S5>  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> <P3-S0> The Mountain Division (later the Mountain Subdivision) is a railroad line that was once owned and operated by the Maine Central Railroad (MEC). <P3-S1>  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. <P3-S2>  The line was abandoned in 1983 by MEC's successor, Guilford Transportation Industries (GTI). <P3-S3>  Guilford retained a stub between Portland and Westbrook. <P3-S4>  A section in New Hampshire remains in use by heritage railway Conway Scenic Railroad.