sentences:  The 81st Street-Museum of Natural History station of the IND Eighth Avenue Line is located at 81st Street and Central Park West, and is served by trains that are local at all times.On the east side, the 77th Street station on the IRT Lexington Avenue Line, two blocks south, is served by during the daytime and during late nights.The M79 SBS crosstown bus route runs from between the 79th Street Boat Basin and East End Avenue at all times.