Editing Diesel multiple unit (section)

{{Short description|Diesel-powered railcar designed to be used in formations of 2 or more cars}}
{{Use dmy dates|date=May 2024}}
[[File:JNR kiha40 136 erimo.jpg|thumb|right|A [[KiHa 40 series|JNR Class KiHa40]] in use for Erimo Express service, Hokkaido, Japan]]
[[File:Dublin 1.jpg|thumb|right|An [[IE 29000 Class]] diesel multiple unit on a [[Dublin Suburban Rail|western commuter]] service at [[Connolly station|Dublin Connolly Rail station]], Ireland]]
{{Multiple unit}}
[[File:Class 185 at Manchester Piccadilly.jpg|thumb|right|A [[British Rail Class 185]] diesel hydraulic multiple unit operated by [[TransPennine Express]] at [[Manchester Piccadilly station]], United Kingdom]]

A '''diesel multiple unit''' or '''DMU''' is a [[multiple-unit]] train powered by on-board [[diesel engine]]s. A DMU requires no separate [[locomotive]], as the engines are incorporated into one or more of the carriages. Diesel-powered single-unit [[railcar]]s are also generally classed as DMUs. Diesel-powered units may be further classified by their transmission type:  diesel–mechanical '''DMMU''', diesel–hydraulic '''DHMU''', or diesel–electric '''DEMU'''.