The 9 operated during rush hour periods from 1989 to 2005, as a variant of the 1, providing service between Van Cortlandt Park–242nd Street in Riverdale, Bronx, and South Ferry in Lower Manhattan. The 1 ran in a skip-stop service pattern during rush hours, with the 9 providing the complementary skip-stop service on the same route. The 9 was temporarily suspended between 2001 and 2002 due to severe damage to the Broadway–Seventh Avenue Line caused by the September 11 attacks, and was permanently discontinued in 2005 as a result of a decrease in the number of riders benefiting.