The LGV Interconnexion Est is a short French high-speed rail line that connects the LGV Nord, LGV Sud-Est and LGV Atlantique through suburbs of Paris. Opened in 1994, it consists of three branches, which begin at Coubert:
west branch: towards Paris and western France, terminating at Valenton joining LGV Atlantique at Massy TGV. north branch: towards northern France, London and Brussels, joining the LGV Nord at Vémars south branch: towards southeastern France, joining the LGV Sud-Est at Moisenay The south and west branches are now shared with the LGV Sud-Est line.
Maximum line-speed throughout is 300km/h (186mph) although nearly all services call at Aéroport Charles de Gaulle 2 TGV and Marne-la-Vallée – Chessy in which speed is gradually reduced to allow trains to stop at each station.