Channel Tunnel in the context of "Edward Watkin"

Eurostar is an international high-speed rail service in Western Europe, connecting Belgium, France, Germany, the Netherlands, and the United Kingdom through the Channel Tunnel.

The service is operated by the Eurostar Group which was formed from the merger of Eurostar, which operated trains through the Channel Tunnel to the United Kingdom, and Thalys which operated entirely within continental Europe.

The railway system in Great Britain is the oldest railway system in the world. The first locomotive-hauled public railway opened in 1825, which was followed by an era of rapid expansion. Most of the track is managed by Network Rail, which in 2024 had a network of 9,848 miles (15,849 km) of standard-gauge lines, of which 3,810 miles (6,130 km) were electrified. In addition, some cities have separate metro, light rail and tram systems, among them the historic London Underground and the Glasgow Subway. There are also many private railways, some of them narrow-gauge, which are primarily short lines for tourists. The main rail network is connected with that of continental Europe by the Channel Tunnel and High Speed 1, opened in 1994 and 2007 respectively.

In 2024, there were 1.612 billion journeys on the National Rail network, making the British network the fifth most used in the world (Great Britain ranks 23rd in world population). Unlike a number of other countries, rail travel in the United Kingdom has enjoyed a renaissance in recent years, with passenger numbers approaching their highest ever level (see usage figures below). This has coincided with the privatisation of British Rail, but the cause of this increase is unclear. The growth is partly attributed to a shift away from private motoring due to growing road congestion and increasing petrol prices, but also to the overall increase in travel due to affluence. Passenger journeys in Britain grew by 88% over the period 1997–98 to 2014 as compared to 62% in Germany, 41% in France and 16% in Spain.

Calais (UK: /ˈkæleɪ/ KAL-ay, US: /kæˈleɪ/ kal-AY, traditionally /ˈkælɪs/ KAL-iss, French: [kalɛ] ) is a French major port city in the Pas-de-Calais department, of which it is a subprefecture. Calais is the largest city in Pas-de-Calais. The population of the city proper is 67,544; that of the urban area is 144,625 (2020). Calais overlooks the Strait of Dover, the narrowest point in the English Channel, which is only 34 km (21 mi) wide here, and is the closest French town to England. The White Cliffs of Dover can easily be seen from Calais on a clear day. Calais is a major port for ferries between France and England, and since 1994, the Channel Tunnel has linked nearby Coquelles to Folkestone by rail.

Because of its position, Calais has been a major port and an important centre for transport and trading with England since the Middle Ages. Calais came under English control after Edward III of England captured the city in 1347, followed by a treaty in 1360 that formally assigned Calais to English rule. Calais grew into a thriving centre for wool production, and came to be called the "brightest jewel in the English crown" because of its importance as the gateway for the tin, lead, lace and wool trades (or "staples"). Calais remained under English control until its recapture by France in 1558.

The Pas-de-Calais (French: [pɑ d(ə) kalɛ] , 'strait of Calais'; Picard: Pas-Calés; Dutch: Nauw van Calais) is a department in northern France named after the French designation of the Strait of Dover, which it borders. It has the most communes of all the departments of France, with 890, and is the 8th most populous. It had a population of 1,465,278 in 2019. The Calais Passage connects to the Port of Calais on the English Channel. The Pas-de-Calais borders the departments of Nord and Somme and is connected to the English county of Kent via the Channel Tunnel.

The West Coast Main Line (WCML) is a significant railway corridor in the United Kingdom, which connects the major cities of London and Glasgow with branches to Birmingham, Manchester, Liverpool and Edinburgh. It is one of the busiest mixed-traffic railway routes in Europe, carrying a mixture of inter-city rail, regional rail, commuter rail and rail freight traffic. The core route of the WCML runs from London to Glasgow for 399 miles (642 km) and was opened between 1837 and 1881; this totals a route mileage of 700 miles (1,127 km) by including its many branches. The Glasgow–Edinburgh via Carstairs line connects the WCML to Edinburgh; however, the main London–Edinburgh route is the East Coast Main Line via York. Several sections of the WCML form part of the suburban railway systems in London, Coventry, Birmingham, Manchester, Liverpool and Glasgow, with many more smaller commuter stations, as well as providing links to more rural towns.

It is one of the busiest rail freight routes in Europe, carrying 40% of all UK traffic. The line is the principal rail freight corridor linking the European mainland (via the Channel Tunnel) through London and South East England to the West Midlands, North West England and Scotland. The line has been declared a strategic European route and designated a priority Trans-European Networks (TENS) route. A number of railway writers refer to it as "The Premier line".

Hauts-de-France (French: [o d(ə) fʁɑ̃s] ; Picard: Heuts d'Franche; lit. 'Heights of France'), also referred to in English as Upper France, is the northernmost region of France, created by the territorial reform of French regions in 2014, from a merger of Nord-Pas-de-Calais and Picardy. Its prefecture is Lille. The new region came into existence on 1 January 2016, after regional elections in December 2015. The Conseil d'État approved Hauts-de-France as the name of the region on 28 September 2016, effective the following 30 September.

With 6,009,976 inhabitants as of 1 January 2015 and a population density of 189 inhabitants per km, it is the third most populous region in France and the second-most densely populated in metropolitan France after its southern neighbour Île-de-France. It is bordered by Belgium to the north and by the United Kingdom to the northwest through the Channel Tunnel, a railway tunnel crossing the English Channel. The region is a blend mixture of French and (southern-) Dutch cultures.

Marl is an earthy material rich in carbonate minerals, clays, and silt. When hardened into rock, this becomes marlstone. It is formed in marine or freshwater environments, often through the activities of algae.

Marl makes up the lower part of the cliffs of Dover, and the Channel Tunnel follows these marl layers between France and the United Kingdom. Marl is also a common sediment in post-glacial lakes, such as the marl ponds of the northeastern United States and marl lakes of the Canadian Rockies.

Eurostar Group is the parent holding company of the Eurostar high-speed rail service. It wholly owns Eurostar International Limited (EIL), which operates Eurostar services via the Channel Tunnel, and THI Factory (THIF), which operates Eurostar services within continental Europe. Eurostar Group is majority-owned by SNCF Voyageurs and is based in Brussels, Belgium.