Featuring several advances in design, accessibility, and technology over older Seibu Railway sets, the 6000 series was designed for use on through services to the TRTA (now Tokyo Metro) Yurakucho Line and also intended to serve as the basis for future Seibu train types.

The 6000 series was developed for use on through services to the Yurakucho Subway Line, as well as to be the basis for future Seibu Railway vehicles.

[3]: 76  The all-over "lemon yellow" livery used with several older Seibu train designs was discontinued in favour of bodyside blue and white accents.

[3]: 80 The interior is equipped with longitudinal seating throughout,[2] with production sets being fitted with wheelchair spaces from new.

Additionally, Hitachi took over production of the 6000 series fleet;[5] the manufacturer had previously supplied traction systems for earlier sets.

[3] As of May 2022,[update] all subsequent Seibu train types had incorporated monolink bogies, excluding the 001 series Laview trainsets.

[1] Some sets were initially adorned with green markers, but the colour used was eventually standardized to yellow.

[11] Ahead of the introduction of Tokyo Metro Fukutoshin Line through services,[1][11] twenty-three 6000 series sets were refurbished between 2006 and 2010.

[14] From 18 April 2015, set 6157 was returned to service in a special all-over yellow livery to mark the 100th anniversary of the Seibu Ikebukuro Line.