MD 7's name changes to Old Philadelphia Road as it crosses Grays Run. Beyond Stepney Road, the state highway curves to the southeast to cross over CSX's Philadelphia Subdivision, passing between industrial parks before reaching its eastern terminus at US 40 (Pulaski Highway) on the western edge of Aberdeen. Old Philadelphia Road continues east as MD 159 before becoming a county highway that serves an industrial area, intersects MD 715 (Short Lane), and passes the historic home Poplar Hill, after which the highway merges with US 40 just west of downtown Aberdeen.