H0 Scale (1:87) is the world’s most popular model railway standard for a reason. Striking the perfect balance between intricate detail and space-saving practicality, it offers a vast universe of rolling stock and accessories. At Heljan, we bring this global scale to life with high-performance engineering and uncompromising prototypical accuracy. HO uses a 1:87 ratio. It runs on 16.5mm track (the same gauge as OO, but with a smaller body scale for true-to-life proportions).