curves away from the railroad just west of the Martin State Airport station on MARC's Penn Line and the highway's intersection with MD 43 (White Marsh Boulevard). East of MD 43 and the adjacent General Services Administration facility, MD 150 becomes a five-lane road with a center left-turn lane east to Carroll Island Road. East of that county highway, which leads to the community of Bowleys Quarters, the state highway reduces to two lanes. MD 150 passes under a Norfolk Southern Railway spur from Amtrak's Northeast Corridor to the former Charles P. Crane Generating Station and intersects Marshy Point Road, which leads into Dundee Natural Environment Area. The route ends at its intersection with Ebenezer Road and Graces Quarter Road in the community of Chase. Graces Quarter Road serves as a connector to the main section of the county highway, which heads east into a unit of Gunpowder Falls State Park. The county highway also heads west as Ebenezer Road, which passes over Eastern Avenue and Amtrak's Northeast Corridor immediately to the northeast on Eastern Avenue. Eastern Avenue itself continues northeast as a county highway to its end at Greenbank Road on the Gunpowder River. History The predecessor highway of MD 150 was an oyster shell road from the village of Highlandtown (later annexed by Baltimore) to Chase. Between the Back River and Middle River, this highway was operated as the east–west segment of the Back River Neck Turnpike; the turnpike also included what is now Back River Neck Road. The first portion of Eastern Avenue improved by the Maryland State Roads Commission was from the eastern terminus in Chase to east of Earls Road, which was paved as a wide concrete road around 1923. MD 150 was constructed as a macadam road from the Baltimore city line to the crossing of Middle River in 1924; this section would be widened with concrete shoulders to a width of by 1926. The gap between the Middle River and east of Earls Road remained a county highway until the existing highway was supplemented by concrete shoulders and repaved in macadam between 1932 and 1934. The portion of Eastern Avenue in the city of Baltimore was not part of MD 150, which had its western terminus at the city–county line as of 1939. Suburban development in Dundalk and Essex and the establishment of the Glenn L. Martin Company aircraft manufacturing plant in Middle