Hybrid multiple units

The R sets are a class of bi-mode multiple units (EDMU) being built by as part of the Regional Rail Project to replace NSW TrainLink's ageing Xplorer and XPT fleets for long-distance services, as well as Sydney Trains' Endeavour fleet for diesel intercity services.

The British Rail Class 802 is a type of high-speed bi-mode multiple-unit passenger train designed and produced by the Japanese manufacturer Hitachi Rail. It has been operated by Great Western Railway, TransPennine Express, and Hull Trains; each of these train operating companies has given its own units a unique brand: Great Western Railway's units are branded Intercity Express Trains (IETs), TransPennine Express units are branded Nova 1s and Hull Trains' units are branded Paragons.

The British Rail Class 756 FLIRT is a class of tri-mode multiple units built for Transport for Wales Rail by Swiss rolling stock manufacturer Stadler Rail. They are closely related to the Class 755 bi-mode units delivered by Stadler to Greater Anglia between 2018 and 2020, which can be powered either by overhead electric lines or on-board diesel generators. The Class 756 units also carry batteries as an additional source of traction power.

The British Rail Class 810 Aurora is a type of bi-mode multiple unit being constructed by Hitachi Rail for East Midlands Railway (EMR). Based on the Hitachi AT300 design, 33 five-car units will replace Class 222 units on EMR's intercity routes from 2025.

The British Rail Class 799 HydroFLEX is a prototype class of bi-mode multiple unit adapted from Class 319 electric multiple units (319001/382). The existing 25 kV AC and 750 V DC equipment has been retained with a hydrogen fuel cell added, currently taking up one of the carriages.

The British Rail Class 800, branded as the Intercity Express Train (IET) by Great Western Railway (GWR) and Azuma by London North Eastern Railway (LNER) is a type of bi-mode multiple unit train built by Hitachi Rail for GWR and LNER. The type uses electric motors powered from overhead electric wires for traction, but also has diesel generators to enable trains to operate on unelectrified track. It is a part of the Hitachi AT300 product family.

The British Rail Class 805 Evero is a type of bi-mode multiple unit built by Hitachi Rail for Avanti West Coast. Based on the Hitachi A-train design, 13 five-car units were built to replace Class 221s on services between London Euston, Birmingham New Street and stations on the North Wales Coast lines. Their introduction allowed the elimination of long-distance diesel working on electrified routes.

The British Rail Class 755 FLIRT is a class of bi-mode multiple unit passenger train built by Stadler Rail for Greater Anglia. Part of the FLIRT (Fast Light Intercity and Regional Train) modular train family, the trains first entered service on 29 July 2019 and are used on regional and local services throughout East Anglia, as well as some intercity services between Norwich and London.

The British Rail Class 769 Flex is a class of bi-mode multiple unit (BMU) converted by Brush Traction, and running in service with Northern Trains. The train is a conversion of the existing Class 319 electric multiple unit (EMU), a conventional unit type which had become surplus to requirements during the 2010s.