Edmonston Road on the eastern edge of Beltsville. The intersection also serves as the signed eastern terminus of MD 212, which is officially MD 212A at this location. Powder Mill Road continues east as the main highway through the research farm; Edmonston Road continues north as a county highway. MD 201 is part of the main National Highway System from the District of Columbia to MD 459 just north of MD 201's interchange with US 50 and the Baltimore–Washington Parkway in Tuxedo. The highway is also an intermodal connector from Paint Branch Parkway near College Park to Cherrywood Lane in Greenbelt and a National Highway System principal arterial from MD 459 to Paint Branch Parkway. History The first segment of MD 201, which was then known as River Road, was constructed as a concrete road from the District of Columbia boundary to Tuxedo Road (now MD 459) in Tuxedo in 1926 and 1927. The highway was extended north to US 50 (now MD 450) in Bladensburg in 1929. MD 201 was widened with a pair of bituminous shoulders along its entire length in 1941. The state highway originally followed what is now MD 965 north from Eastern Avenue along the northbound side of the modern highway. MD 201 continued along a road that no longer exists across Beaverdam Creek and the Pennsylvania Railroad (now Amtrak Northeast Corridor). North of what is now US 50, the highway followed the Kenilworth Avenue portion of MD 459 to its junction with MD 201, where the route was broken by modern MD 201 and the Baltimore–Washington Parkway. MD 201 continued along what are today MD 769D and MD 769C (52nd Avenue, Quincy Street, and 48th Street) to US 50 in Bladensburg. The first segment of MD 205, which comprised Edmonston Road from Bladensburg to Greenbelt, was constructed as a concrete road from US 50 in Bladensburg to Riverdale Road in Riverdale Park between 1924 and 1926. The highway was extended north to Branchville Road (now MD 193) in Berwyn Heights between 1926 and 1928. MD 205 was widened with a pair of bituminous shoulders along its entire length in 1940. The highway was relocated and given two new bridges across Brier Ditch in 1949 and 1950. MD 205 originally followed Edmonston Road, including all of MD 769B, from Bladensburg to Greenbelt. The highway followed the present alignment of MD 201 from the north end