British Rail Class 93 Tri-mode Locomotive
UK · 2021 (order), 2022 (production start), 2023 (first delivery), 2025 (commercial operation begins) · £4 million per locomotive (estimated)
The judgement call
Account-gated at launchThe development of the Class 93 was driven by Rail Operations Group's interest in bi-mode technology and high-speed freight, aiming to innovate beyond the Class 66 and achieve carbon-neutral operations. - The inclusion of battery packs for boost power and regenerative braking highlights a commitment to energy efficiency and reduced emissions, moving towards the DfT's goal of eliminating diesel-only traction. - The design for 100 mph operation with freight wagons allows for greater timetable flexibility and increased capacity on the national network, addressing a key operational challenge. - The project demonstrates the evolution of locomotive technology from bi-mode (Class 88) to tri-mode, offering greater operational versatility across electrified and non-electrified lines.
Key engineering challenges
Developing a tri-mode locomotive capable of operating on 25 kV AC overhead electric, diesel, and battery power. - Integrating a 900 kW diesel engine and 400 kW lithium-titanium oxide battery packs for flexible operation and boost power. - Designing for high-speed freight operations (100 mph) to allow integration into passenger timetables. - Ensuring compliance with EU Stage V emissions standards for the diesel engine.
Project facts
- Client / owner
- Rail Operations Group (ROG)
- Lead contractor
- Stadler Rail
- Lead designers
- Stadler Rail
- Project type
- new build; vehicle/fleet programme
- Scale
- 10 locomotives initially ordered (framework agreement for 30); Tri-mode (25 kV AC overhead, 900 kW diesel, 400 kW battery); Max speed: 110 mph (180 km/h); 4,000 kW (5,400 hp) electric power; 1,300 kW (1,700 hp) usable power in hybrid diesel mode.
- Disciplines
- Mechanical; Electrical; Systems; Software
- Standards & frameworks
- EU Stage V emissions standards
Sources: British Rail Class 93 - Wikipedia (https://en.wikipedia.org/wiki/British_Rail_Class_93) - Stadler Rail: Class 93 tri-mode locomotive (https://www.stadlerrail.com/en/solutions/references/class-93-rail-operations-uk-limited) - Rail Engineer: Re-engineering Rail Freight (https://www.railengineer.co.uk/re-engineering-rail-freight/)