British Rail Class 104 diesel multiple units

Design and formation

Class 104 units followed the standard DMU concept of the era: power and driving controls were incorporated within certain cars so that sets could operate without a separate locomotive. Typical formations included two- and three-car sets made up from driving motor vehicles and non-powered trailers. Interiors were laid out for commuter use with a mixture of seating and luggage/guard provision on brake cars. Construction used steel-bodied coaches and conventional multiple-unit control systems, allowing units to work in multiple with other compatible types.

• Common formations: two-car and three-car sets combining powered driving cars and trailers.
• Features: coach-style bodies, driving cabs at unit ends, and multiple-unit control for flexible operation.
• Manufacturer: built by Birmingham Railway Carriage and Wagon Company (builder).

Service history and regional use

The first orders were placed for the London Midland Region, and the majority of Class 104s spent much of their working lives on services in the North West of England. They were also allocated to other areas, including Tyneside, where they operated local services until the opening of the Tyne & Wear Metro in 1980 reduced demand. During their careers some units were transferred around the network to meet changing service patterns, with short periods of operation in Scotland and London.

Withdrawal, repainting and preservation

Withdrawal of the class began in the early 1980s as newer rolling stock and reorganisation of local services reduced the need for first-generation DMUs. The last examples were withdrawn from regular service in 1995. A number of vehicles were repainted or uniquely liveried during later years; one unit repainted in a maroon-and-white scheme for services to Oban became popularly known as the "Mexican Bean". Several sets and individual vehicles have been rescued for preservation and can be seen on heritage lines and at museums.

Importance and notable facts

Class 104 units are representative of the mid-20th-century shift away from steam to multiple-unit diesel operation: they offered decentralized traction, faster turnarounds and economical operation on less busy routes. Their long service span—nearly four decades in many cases—reflects robust construction and the adaptability of first-generation DMU design. For further technical and operational details, see the class overview pages and builder records (Class 104 overview, unit details), and for particulars of the Oban repaint see the regional notes (Oban service note).