There were also some other new tram lines with line numbers that had long since disappeared or had never existed. Line 17, which was closed in 1956, was revived in 1962 (to Osdorp), when line 27 appeared on the old route of line 17. In October 1971, line 1 was extended to Osdorp. Line 27 disappeared in 1971. In 1977, upon the opening of Amsterdam's first metro line, lines 6 and 12 appeared. In 1978, with the opening of Station Zuid), came line 5, and in 1982, a new line 14 (to Station Sloterdijk) was opened, forty years after the lifting of the original line 14.