SNCF B 81661 is a spectacular passing scene on the Cize–Bolozon Viaduct, which is a road-rail bridge crossing the Ain gorge in France. The Cize–Bolozon viaduct is a combination of rail and vehicular viaducts crossing the Ain gorge, linking the communes of Cize and Bolozon. This is an original span built in the same location in 1875 that was actually ruined in World War 2.
Cize–Bolozon Viaduct was reconstructed as a vital post-war plan due to its position on the main line to Paris. However, the new viaduct was revived in May 1950. Interestingly, the Cize–Bolozon Viaduct was only opened five years after the end of the war, on May 14, 1950.
Unique engineering works on the line include the road-rail Cize-Bolozon viaduct, carrying the railway on the high level and the road on the low level, and the overhead conductor rail used in the Bolozon I and Bolozon II tunnels and the open track in between.
It carries road and rail traffic at diverse levels: the railway, which was barred for reinforcement and restoration work in 2005, occupies the upper level. For the vehicles that are crossing the Cize-Bolozon viaduct, the speed falls to 80 km/h and then picks up again to 90 through the Bolozon and Mornay tunnels.
Nevertheless, part of the Ligne du Haut-Bugey reopened in December 2010 as part of the international Paris–Geneva line. However, the local road from Poncin to Thoirette uses the lower level. Racouse tunnel takes the line through the second ridge of the Revermont, and then the Cize–Bolozon Viaduct crosses the river Ain to Bolozon station.
Numerous bridges were destroyed in 1944, starting with the bridge over the Suran on July 8, followed by the Cize–Bolozon Viaduct on the 8th, and the Reyssouze Bridge on September 2.
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