Up until the end of the 19th Century Model Railways where still regarded as toys for children. However at the start of the twentieth century a group of men from England started building model railways as a hobby. Working along with the Germany manufacturer Bing at the time on the the worlds largest toy manufactures they established 4 scales,
O Gauge (1:43.5), Gauge 1 (1:30), Gauge 2 (1:27) and Gauge 3 (1:23).
Where Gauges 1, 2 & 3 where more conducive to live steam O Gauge was more suited to Clockwork and Electric Motors. However at the time with very little material around that would provide insulation of wheels a 3rd rail was used to provide power to the electric motors. This however was practice on railways at the time particularly around London.