Overview

The Channel Tunnel, commonly called the Chunnel and once referred to as the Eurotunnel, is a rail-only tunnel system beneath the English Channel that links the United Kingdom and continental Europe. It runs beneath the Strait of Dover between Folkestone in Kent and Calais in northern France. The full tunnel length is about 50 kilometres (31 miles) and its deepest point lies roughly 75 metres (250 feet) below sea level. The tunnel carries passenger services such as Eurostar and dedicated shuttle trains for vehicles and freight.

Structure and operation

Rather than a single bore, the project comprises two main rail tunnels and a smaller service (escape and maintenance) tunnel between them. Cross-passages connect the three at regular intervals, allowing evacuation and safe access. Trains operate at high speeds on dedicated tracks through the tunnel; some trains are passenger-only, while others transport cars and freight. The infrastructure and traffic are managed by the company that succeeded the original concession holder.

History and construction

Planning and political agreements for a fixed link between Britain and France date back many decades, and serious construction work took place in the late 20th century. Major tunnelling used mechanized boring techniques and careful geological surveying to pass beneath the seabed. The completed tunnel opened to traffic in 1994. Its construction is regarded as one of the major civil engineering achievements of the era and required close binational coordination on engineering, safety and border arrangements.

Uses and importance

The Channel Tunnel serves multiple transport roles: high-speed international passenger services cut journey times between London and Paris to a little over two hours; vehicle shuttle trains enable cars and freight to cross without a ferry; and freight trains provide a land link for goods between the UK and Europe. The tunnel has reduced reliance on short-haul flights and ferries for these routes and has become an important corridor for commerce and tourism.

Notable features and distinctions

The tunnel is notable for being one of the longest undersea passages in the world and for its rail-only design. Safety features include the central service tunnel, cross-passages, and procedures to handle incidents. Border and customs arrangements at terminal stations reflect bilateral agreements that streamline checks for passengers and freight. The project has also had economic, environmental and political implications for transport patterns between the islands and the continent.