wheelsets that are compatible with the trackgauge. Since many different trackgauges exist worldwide, gauge differences often present a barrier to wider
narrow-gauge railway (narrow-gauge railroad in the US) is a railway with a trackgauge narrower than 1,435 mm (4 ft 8+1⁄2 in) standard gauge. Most narrow-gauge
Originally, various trackgauges were used in the United States. Some railways, primarily in the northeast, used standard gauge of 4 ft 8+1⁄2 in (1,435 mm);