London is the starting point for a number of motorway routes. The M25 is an orbital motorway which enables vehicles to avoid travelling through central London and is one of the busiest motorways in Europe.
Eurostar is a high-speed railway service connecting London with Paris and Brussels. All its trains traverse the Channel Tunnel between the United Kingdom and France, owned and operated separately by Eurotunnel.
The service is operated by eighteen-coach Class 373/1 trains which run at up to 300 kilometres per hour (186 mph) on a network of high-speed lines. The LGV Nord line in France opened before Eurostar services began in 1994, and newer lines enabling faster journeys were added later—HSL 1 in Belgium and High Speed 1 in southern England. The French and Belgian parts of the network are shared with Paris–Brussels Thalys services and also with TGV trains. In the United Kingdom the two-stage Channel Tunnel Rail Link project was completed on 14 November 2007 and renamed High Speed 1, when the London terminus of Eurostar transferred from Waterloo International to St Pancras International.
From the mid 1840s until 1857, Barlow was chief engineer for the Midland Railway, after which he set up his on consultancy in London. Between 1862 and 1869 he was the consultant engineer on the Midland Railway's extension from Bedford to London, designing St Pancras station and the 240-foot (73 m) wide cast iron and glass train shed roof over the platforms, the widest unsupported arch in the world at the time.