SE scale is a designation used by some modellers to describe miniature (model) trains which run on either Gauge 1 (45mm or 1.772in) track or O gauge (32mm or 1.26in) track. In the SE scale, 7/8 of an inch equals one foot, which is a ratio of 1:13.7. On 45mm (1.772in) gauge track this represents real life narrow-gauge railways that are 2ft (610mm) gauge, while on 32mm (1.26in) gauge track this represents 18in (457mm) railways.
Modelling on a scale where 7/8 inch = 1 foot is relatively new (within the last 20 years)[yearneeded] and, as a result, the majority of the modellers build from scratch.