Seibu L00 series

The first set features a livery that is based on the Saitama Seibu Lions. The second set is expected to receive a navy blue livery with decorations inspired by the fireworks and illuminations at the Seibu-en amusement park. ==Interior==

Passenger accommodation consists of mostly longitudinal seating throughout with a bench seat for one child and one adult faces at the front end of each lead car. All cars have an accessible "free space". The intermediate cars feature showcase displays. LCD displays are installed above the doorways. ==Formation==

Sets are formed as shown below. ==History==

Details of the new Leo Liner train type on order were first announced on 22 January 2025. On 18 November 2025, Seibu announced that the new Leo Liner train type would be classified as the L00 series. The first set was unveiled at the Mitsubishi Heavy Industries Mihara works on that same day and delivered later in that month. The L00 series entered revenue service on 27 March 2026. Following that, one set is scheduled to be introduced every year until fiscal 2027. ==References==