The Grand Sud-Ouest railway project (GPSO) plans to connect Toulouse and Bordeaux by TGV. The financing of this major railway project is based in part on a special equipment tax (TSE) Opponents ask the Constitutional Council to clarify whether “the application of local taxes resulting from the 2023 finance law complies with the principle of equality before the law guaranteed by the Constitution’ The GPSO project is deemed to be national in scope.