Ligne du Haut-Bugey

Ligne du Haut-Bugey
Cize-Bolozon station and viaduct
Technical
Line length	64.727 km (40.219 mi)
Rack system	no[1][2]
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Minimum radius	300 m (984 ft)
Electrification	1.5 kV DC or 25 kV 50 Hz
Operating speed	120 km/h (75 mph)
Maximum incline	35 ‰
Route map Legend to Besançon, Mâcon and Paris 0.000 Bourg-en-Bresse 0.211 to Lyon and Ambérieu 9.860 Ceyzériat 12.100 Tunnel de Sénissiat (186 m) 12.803 Sénissiat-Revonnas 15.075 Viaduc de Ramasse 18.900 Villereversure 19.320 Pont sur le Suran 22.351 Simandre-sur-Suran 23.120 Tunnel de Racouse (1686 m) 24.810 Viaduc de Cize-Bolozon 25.060 Cize-Bolozon 29.445 Tunnel de Bolozon 1 (201 m) 29.696 Tunnel de Bolozon 2 (817 m) 31.235 Tunnel de Mornay (2565 m) 33.047 Nurieux 35.617 Brion—Montréal-la-Cluse branch to Oyonnax and St. Claude 36.750 La Cluse 38.645 Tunnel de la Malatière (279 m) 40.427 Nantua 43.199 Les Neyrolles 46.970 Tunnel de Sylans (617 m) 49.069 Charix–Lalleyriat 53.748 Saint-Germain-de-Joux 54.965 Viaduc de Tacon 57.845 Tunnel de Trébillet (86 m) 58.105 Former Tunnel de La Crotte (136 m) 59.214 Châtillon-en-Michaille 59.715 Tunnel de Châtillon (257 m) 63.975 Tunnel de Musinens (573 m) Line from Lyon via Culoz 134.252 65.088 Bellegarde-sur-Valserine Line to Geneva

The Haut-Bugey line (French: Ligne du Haut-Bugey) (also nicknamed Lignes des Carpates) is a railway line in France. It is 65 kilometres in length and connects Bourg-en-Bresse with Bellegarde, travelling through the Jura Mountains. For a century and a quarter after its opening in 1877, it was a local line only, and with steep grades, tight curves, and a long poorly ventilated tunnel, it was a challenging line to operate. It suffered a gradual decline, until in 2006 it had a new lease of life as its renovation was chosen as the most cost-effective way to shorten the journey time from Paris to Geneva. The line was closed in 2006 for complete reconstruction and electrification. The upgraded line was inaugurated on 2 December 2010 featuring 25 kV AC electrification, replacement of 18 level-crossings with bridges, avalanche protection and daylighting a tunnel.^[3] Today the line enables a faster link between the French TGV network and Geneva, giving a Paris to Geneva journey time of just over three hours (a saving of nearly 20 minutes compared to the old route via Amberieu and Culoz).