Eurostar is a train service primarily connecting London and Kent in Britain, with Paris and Lille in France, and Brussels in Belgium. In addition to these three-capitals services, there are limited services from London to Disneyland and several seasonal destinations in France. Trains cross under the English Channel through the Channel Tunnel.

The service is operated by a fleet of specially designed eighteen-carriage Class 373 trains which travel at up to 300 km/h (186 mph) on a network of high-speed railway lines. Since the Eurostar service began in 1994, new lines have been built in Belgium (HSL 1) and Southern England (High Speed 1) to the same standards as the LGV Nord line originally used in France, enabling journey times to be progressively reduced. The two-stage High Speed 1 project was completed on November 14, 2007, when the London terminus of the Eurostar service transferred from Waterloo International to St Pancras International station.