The 7mm Narrow Gauge Association is a United Kingdom based society for railway modellers interested in modelling narrow-gauge railways in British O scale (7mm to the foot, or 1:43.5 ratio).
[2] While many members model British railways, prototypes from all round the world are catered for, including the railways of countries that were part of Britain's former empire.
Most are resident in the United Kingdom, but about 10% live overseas.
[2] The association publishes a bi-monthly magazine, Narrow Lines, which is posted free to all members.
Additionally, the association has published a series of 5 handbooks on various aspects of modelling, and a series of 12 booklets containing scale drawings of various items of narrow-gauge rolling stock.