For the first time in British ready-to-run history, TT:120 delivers a true scale-to-gauge ratio. By using a 1:120 scale on 12mm track, the "squashed" look of traditional OO is gone, replaced by authentic proportions and sleek, prototypical lines. Heljan is proud to support this growing community with next-generation tooling, featuring high-specification electronics and the legendary smooth performance our customers expect.