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Groupe Eurotunnel S.A. manages and operates the Channel Tunnel between Britain and France including the vehicle shuttle services, and earns revenue on other trains (DB Schenker freight and Eurostar passenger) through the tunnel. It is listed on both the London Stock Exchange and Euronext Paris. The company is based in Paris. The railway operation has 50.45 kilometres (31.35 mi) of double track railway in the main tunnels, plus extensive surface-level terminal facilities at Folkestone in the UK and at Frethun in France; the operation is entirely self-contained, with connections near the two terminals to the respective national railway networks. Signalling and electric traction supply at 25kV AC are also under Eurotunnel control. Train operation consists of shuttle trains conveying cars and coaches and other trains conveying heavy goods vehicles between the two terminals. Other trains using Eurotunnel infrastructure are operated by the respective owners.