Lego trains use a nominal gauge of 37.5 mm (1+15⁄32 in). This measurement refers to the distance between the inner edges of the rails on the track.
Here's a more detailed breakdown:
- Nominal Gauge: 37.5 mm (approximately 1.48 inches). This is based on 5-stud track centerlines gauge.
- Comparison to O Gauge: The Lego train gauge is about 5.5 mm wider than O gauge, which typically ranges from 30 mm (1.181 in) to 33 mm (1.3 in).
- Scale Ratio: The 37.5 mm length is not derived from a specific scale ratio, meaning Lego trains aren't consistently scaled to match real-world trains.
In simpler terms, while Lego trains may visually resemble certain real-world trains, their size is determined by the Lego system (studs and track design) rather than a strict scale model approach.
