Input (grade 6): In 1963, an extension was added, curving north from Union station, below University Avenue and Queen's Park to near Bloor Street, where it turned west to terminate at St. George and Bloor Streets.
Output (grade 5): In 1963 another part was added, that went north from Union station, below University Avenue and Queen's Park to near Bloor Street, where it turned west to end at St. George and Bloor Streets.