High Speed 1

High Speed 1 is a high-speed railway line connecting London with the Channel Tunnel. It was constructed in two main phases, with the final section opening in 2007, enabling high-speed international services from St Pancras to Paris and Brussels. The line is also used by domestic high-speed commuter services operated by Southeastern throughout Kent.

History

The project, initially known as the Channel Tunnel Rail Link, was developed following the opening of the Channel Tunnel in 1994 to provide a dedicated high-speed connection to London. Construction was managed by Union Railways and later London & Continental Railways, with significant engineering challenges including the Thames Tunnel and passing under the River Thames. The first section to Fawkham Junction opened in 2003, with the full line to St Pancras inaugurated by Queen Elizabeth II in 2007. The line was later sold to a consortium including Borealis Infrastructure and Ontario Teachers' Pension Plan.

Route and infrastructure

The line begins at St Pancras International, passing through the Thames Tunnel to emerge in Essex. It then traverses north Kent, including significant viaducts across the River Medway and the North Downs Tunnel through the Kent Downs. Key intermediate stations include Ebbsfleet International and Ashford International in Kent. The infrastructure features ETCS Level 2 signalling and is electrified at 25 kV AC, designed for speeds up to .

Operations and services

International services are exclusively operated by Eurostar, providing direct connections to Paris, Brussels, Amsterdam, and other European cities like Lyon and Marseille. Domestic services, branded as Southeastern Highspeed, serve destinations including Faversham, Margate, and Canterbury West. All operations are governed by the Office of Rail and Road and comply with European Union interoperability standards, including those of the European Union Agency for Railways.

Economic and social impact

The line has stimulated major regeneration projects, most notably around King's Cross and Stratford, contributing to the development of the Queen Elizabeth Olympic Park. In Kent, areas around Ebbsfleet and Ashford have seen significant commercial and residential growth. Studies by the Department for Transport and Transport for London have highlighted its role in boosting tourism and reducing road and air traffic between London and continental Europe.

Future developments

Proposals have included extending domestic Javelin services further into Kent and potential new international destinations from operators like Deutsche Bahn. The government-owned HS1 Ltd has also explored capacity enhancements and the integration of new rolling stock. The line is often cited as a precedent for the larger High Speed 2 project, with lessons informing its planning and procurement.

Category:Rail transport in the United Kingdom Category:High-speed rail in the United Kingdom Category:Railway lines in London Category:Railway lines in Kent