OO Scale is the most popular model train scale in the United Kingdom. Also known as OO Gauge, these trains run on 16.5mm gauge track (the same as HO scale) but are built to 1:76 scale to properly accommodate motors and electrical components within British-outline locomotives and rolling stock. This unique scale combination makes OO Scale model trains ideal for detailed UK railway layouts. A comparison between the real-world LNER Mallard and the massive Union Pacific Big Boy highlights the dramatic size differences reflected in model form.
Shop top OO Scale brands including Hornby, Peco, and more for locomotives, rolling stock, track, and accessories. In 1938, Lionel also introduced a line of OO Scale trains built to 1:76 scale but running on 18.83mm (3/4") track, produced through 1946 and now considered highly collectible. Want to compare train sizes across scales? View all our model trains to explore additional gauges and model train categories.
