In 1932 a new station was built at le Neyrolles on the new alignment. During the second world war, the line had strategic importance, as there was a lot of resistance activity in the Ain and on the Jura plateau. Several 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 2 September. The Cize Bolozon viaduct was only opened 5 years after the end of the war, on 14 May 1950.