Class 373 EMU

Class 373 EMU
Name	Class 373 EMU
Service	1994–present
Manufacturer	Alstom, GEC-Alsthom
Family	TGV
Yearconstruction	1992–1997
Numberbuilt	38
Formation	18 cars per trainset
Capacity	800–900 passengers
Maxspeed	300 km/h (design)
Gauge	Standard gauge
Traction	Electric
Poweroutput	12,800 kW
Operator	Eurostar, Thalys (limited), SNCF, British Rail, National Rail

Class 373 EMU is a high-speed electric multiple unit introduced for international passenger services between United Kingdom, France, and Belgium in the 1990s. Designed to operate through the Channel Tunnel and on high-speed lines such as LGV Nord and the High Speed 1, the trainset combined features from the TGV Atlantique family and bespoke systems for cross-border operation. The fleet entered service in conjunction with the formation of Eurostar and played a central role in integrating rail links among London, Paris, and Brussels.

Design and Development

The Class 373 EMU was developed by GEC-Alsthom in partnership with British Rail Engineering Limited and SNCF to meet technical and legal requirements imposed by the Channel Tunnel Act 1987 and interoperability standards of the European Union. Influences from the TGV Atlantique and the TGV Réseau program informed aerodynamics, bogie design, and powertrain choices, while bespoke fire-safety systems addressed requirements from the Intergovernmental Commission overseeing the Channel Tunnel Safety Authority. Chief design inputs referenced research by SNCF Direction Technique and testing at the high-speed test track near LGV Atlantique and the Velim railway test circuit.

Technical Specifications

The 18-car formation used distributed power via two power cars derived from TGV Atlantique traction modules, delivering approximately 12,800 kW and a nominal top speed of 300 km/h, compatible with signalling systems including TVM-430, KVB, AWS, and TPWS. Trainsets were built for multiple-voltage operation across 25 kV AC, 3 kV DC, and 750 V DC networks to permit cross-border running into networks operated by SNCB/NMBS and Network Rail. Bogies incorporated technology from Alstom Prima designs and were fitted with disc brakes, regenerative braking systems, and wheel-slide protection derived from Ansaldo and Siemens subsystems. Onboard systems included climate control specified by Eurostar International Limited and passenger information suites integrating equipment from Thales Group and Siemens Mobility.

Operations and Service History

Class 373 EMUs entered service with British Rail’s successor entities as part of the new Eurostar franchise, operating scheduled services from London St Pancras and London Waterloo to Paris Gare du Nord and Brussels-South. The trainsets were central to linking the United Kingdom with the Schengen Area and coordinated with border control arrangements involving the United Kingdom Border Agency and French Ministry of the Interior. Fleet management and maintenance were handled at depots in North Pole Depot, Eureka Depot, and facilities at Fretin in France, and partnership agreements involved SNCF Voyageurs and private operators. Over time, some units performed charter services for events such as the UEFA Champions League finals and mass transport during the 2000 Sydney Olympics related delegations, while scheduled timetables adjusted with the opening of High Speed 1 and competition from Air France and Ryanair.

Safety and Incidents

Safety features included enhanced fireproofing to comply with regulations from the Intergovernmental Commission and evacuation protocols akin to those of TGV operations overseen by SNCF Réseau. Incidents involving Class 373 sets prompted investigations by bodies such as the Office of Rail and Road and the French Land Transport Accident Investigation Bureau (BEA-TT), including collisions, debris strikes, and the 2000 tunnel fire exercises inspired by lessons from international accidents like the Eschede disaster and the Mont Blanc tunnel fire. Modifications following incidents involved reinforcement of electrical systems, updates to braking software developed with Bombardier Transportation engineers, and retrofits to onboard communications in line with European Railway Agency recommendations.

Variants and Conversions

Variants included shortened formations and modified sets adapted for domestic high-speed services by SNCF and converted units for charter and freight-related escort duties. Conversion programs coordinated with Alstom and Siemens produced units with upgraded signalling suites to operate on extended networks including LGV Méditerranée and interfaces for Thalys shared-route compatibility with NMBS/SNCB. Experimental refits tested alternative interior layouts inspired by designs used on Eurostar e320 and seating schemes by Pininfarina consultants, while technical upgrades trialled asynchronous traction in collaboration with CEA research teams.

Preservation and Legacy

A small number of Class 373 cars and components were earmarked for preservation by institutions such as the National Railway Museum, the Musée des Transports Urbains, and private preservation groups including the Heritage Rail Association. The design influenced subsequent high-speed fleets including the Class 374/e320 and informed cross-border regulatory frameworks in the European Union Agency for Railways era. The 373’s role in establishing fast international links helped reshape perceptions of continental connectivity between hubs like London, Paris, Brussels, Lille, and Calais and contributed to infrastructure developments associated with High Speed 1 and LGV Nord.

Category:High-speed trains Category:Rolling stock introduced in 1994