Originally opening in March 2000, the museum was refurbished and expanded with a new outdoor exhibition area in 2013, re-opening on 10 October to mark the 100th anniversary of Keio.

[2] First appearing in 1972, the 6000 series was the first rolling stock operated by Keio with 20 m long carriages and four pairs of doors per side.

[2] DeHa 6438 was built in March 1989 by Tokyu Car, initially numbered 6420, as part of a 2-car set for use on overground services.

[2] The 5000 series was the first Japanese commuter rolling stock to feature air conditioning.

[2] After World War II, it was again rebuilt as a motor unit with one cab, and renumbered DeHa 2410.