N scale trains were first commercially produced at 1:160 scale in 1962 by the Arnold company of Nuremberg. This standard size was imported to the US by firms such as the Aurora Plastics Corporation. However, the early N-scale motors would not fit in the smaller models of British locomotives, so the British N gauge was standardized to allow a slightly larger body size. Similar sizing problems with Japanese prototypes led to adoption of a 1:150 scale standard there. Since space is more limited in Japanese houses, N scale has become more popular there than HO scale.