The project has upgraded existing tracks to enable higher speeds by both TGV and regular trains. While the result of the ‘’ is not a true ' (HSL)—the line remains a '—it will still be an important element in the TGV network, linking the LGV Sud-Est to Geneva. The reopened line has reduced journey times between Paris and Geneva due to both a shorter distance and higher speeds. The improved line now allows TGV trains to shorten their route to Geneva by 47 kilometres, reducing the Paris–Geneva journey time by about twenty minutes to just over three hours. In addition, the non-TGV services between Mâcon and Geneva via Bourg-en-Bresse and Bellegarde-sur-Valserine have been improved. Following completion, the project significantly increases freight capacity on the Ambérieu–Culoz section of the Lyon-Geneva line, as passenger trains use the Haut-Bugey line instead.