noun
gauge-changing train; free gauge train
A train capable of running on both standard and narrow gauge tracks by adjusting its wheel spacing. A wasei-eigo term used in Japanese railway technology.
wasei-eigo (Japanese-coined English), from free gauge train
フリーゲージトレインは新幹線と在来線の両方を走行できる。
The free gauge train can run on both Shinkansen and conventional lines.