Since June 2023, the future INOUI TGV (5th generation rolling stock, named TGV M) has been undergoing tests on the French national railway network. This campaign, which is being stepped up with the arrival of a new test train, will last until the end of 2023, before the acceptance test phase in 2024. The TGV M, the future INOUI TGV, from Alstom’s Avelia Horizon range, is entering a new phase of testing. Ordered by SNCF Voyageurs for 115 trainsets at a cost of around 3.5 billion euros, it represents the 5th generation of TGVs and the realisation of a historic industrial and innovation project between SNCF Voyageurs and the French designer and manufacturer Alstom. (....)