 Consequently, even though regional railroads are much diminished in scope and influence, Mountain Top yard, once used as a marshaling yard at the top of the Ashley Planes funicular (cable driven) railway, is still an important regional element of the transportation infrastructure connecting Allentown and Philadelphia with points north and west via trackage to several yards in New York State.Mountain Top is elevated at above sea level.At the 2000 census there were 15,269 people in 5,556 households, including 4,394 families, in the CDP.