The Odakyu 4000 series (小田急4000形, Odakyū 4000-gata?) is a commuter electric multiple unit (EMU) train type operated by the Odakyu Electric Railway in Japan since 2007.
The first train was delivered in May 2007, and the trains entered service in September 2007 on inter-running services between Odakyu and the Tokyo Metro Chiyoda Line, displacing 1000 series sets, which were cascaded to surface lines to replace older 5000 and 5200 series sets.
The trains are based on the JR East E233 series EMU design, but with narrow bodies to permit subway running. The traction motors are fully enclosed, as on the 50000 series VSE sets, to reduce environmental noise.
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“I look on trade and every mechanical craft as education also. But let me discriminate what is precious herein. There is in each of these works an act of invention, an intellectual step, or short series of steps taken; that act or step is the spiritual act; all the rest is mere repetition of the same a thousand times.”
—Ralph Waldo Emerson (1803–1882)