The Gauge Change Train (GCT), known in Japan as the Free Gauge Train (FGT), is a Japanese project started in 1994 to help develop a high-speed train with variable gauge axles that was able to inter-run between 1,435 mm (4 ft 8 1/2 in) and 1,067 mm (3 ft 6 in) tracks. The project has been on hiatus since 2017.