Seibu Yūrakuchō Line

Seibu Yūrakuchō Line
A lineup of Seibu Yūrakuchō Line rolling stock, June 2009
Overview
Type	Commuter rail
Locale	Nerima, Tokyo
Termini	Nerima Kotake-Mukaihara
Stations	3
Operation
Owner	Seibu Railway
Technical
Line length	2.6 km (1.6 mi)
Number of tracks	2
Track gauge	1,067 mm (3 ft 6 in)
Electrification	1,500 V DC, overhead catenary

The Seibu Yūrakuchō Line (西武有楽町線, Seibu Yūrakuchō-sen^?) is a commuter subway line operated by the private railway operator Seibu Railway in Japan. The line links the Seibu Ikebukuro Line at Nerima Station with the Tokyo Metro Yūrakuchō Line and Tokyo Metro Fukutoshin Line at Kotake-Mukaihara Station in Nerima, Tokyo.

Seibu 6000 series

Tokyo Metro 7000 series

Tokyo Metro 10000 series

Tokyu 5050-4000 series

The line started out with the section between Shin-Sakuradai and Kotake-Mukaihara, and began through operations with the TRTA (now Tokyo Metro) Yūrakuchō Subway Line. At this point, the line did not connect with any other Seibu Line, so only TRTA trainsets were used. In 1994, the line was extended from Shin-Sakuradai to Nerima, connecting with the Seibu Ikebukuro Line. Because of track elevation work at Nerima, only one track was used. Later in 1998, the section between Shin-Sakuradai and Nerima became double-tracked, and through services with the Ikebukuro Line began.

Station numbering was introduced on all Seibu Railway lines during fiscal 2012, with Seibu Yurakucho Line stations numbered prefixed with the letters "SI" (part of the Seibu Ikebukuro group of lines).

From 10 September 2012, 10-car 5050-4000 series sets entered revenue service on the Seibu Yurakucho Line and Seibu Ikebukuro Line, with inter-running through to the Tokyo Metro Fukutoshin Line.