The first published O14 standards appeared in Model Railway Constructor magazine, September 1951.

Very little more happened regards the development of O14 until Roy C Link published a new set of standards (1993 — revised 1994) in his magazine Narrow Gauge and Industrial Railway Modelling Review.

They were developed for his range of O14 kits — now produced by David Janes under the name KBscale.

They are based on the proven 4 mm scale EM standards (BRMSB) and are reasonably close to exact scale especially considering the variations to be found in prototype nominal 2 ft (610 mm) gauge railways.

Other 7 mm scale narrow-gauge model railway gauges include: O16.5, On30 and O21.