High Quality Content by WIKIPEDIA articles! The Tokyo Metro 9000 series ( T?ky? Chikatetsu 9000-kei ) is an EMU type which operates on the Tokyo Metro Namboku Line in Tokyo, Japan.A prototype 4-car set was built by Kawasaki Heavy Industries in 1990 (formed of cars 9101-9201-9301-9801) for testing on the Chiyoda Line prior to the opening of the Namboku Line in 1991.Full-production 4-car sets 02 to 07 were delivered in 1991 ahead of the Namboku Line opening, followed by an additional set, set 08 to act as a spare, in 1992. The original 4-car sets were reformed as 6-car sets coinciding with the opening of the extension of the line from Yotsuya to Komagome on 26 March 1996. This was achieved by renumbering the centre cars (9200 and 9300) of sets 02, 04, 06, and 08 as 9600 and 9700 cars which were inserted into sets 01, 03, 05, and 07. New-build (2nd batch) intermediate cars (9200-9300-9600-9700) were then inserted into sets 02, 04, 06, and 08. The resulting minor differences led to odd-numbered sets 01 to 07 being classified as "A sets", and even-numbered sets 02 to 08 becoming "B sets".

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