The Odakyu 50000 series (小田急50000形, Odakyū 50000-gata) or VSE (Vault Super Express) was an electric multiple unit (EMU) train type operated by Odakyu Electric Railway on Romancecar services in Japan.

Designed by architect Noriaki Okabe,[2] the 50000 series was developed in response to a decrease in limited express service usage to the Hakone region.

[2] The 50000 series had regenerative brakes, and was equipped with air suspension and tilting for passenger comfort.

In the leading cars, the frontmost seats could be arranged in a longitudinal, lounge-like configuration.

[7] However, as a result of the train type's overall difficulty to repair and advanced technology required to do so, Odakyu announced on 17 December 2021 its decision to retire them.