There are more than 400 miniature railways in Britain. Some are hidden away and privately owned, others are parkland attractions, and some – such as the Romney, Hythe and Dymchurch – are large commercial enterprises.They come in an array of gauges (from 5 inches up to 15 inches and sometimes beyond), but their most definitive characteristic is that they can carry passengers, whether sitting astride the rolling stock or inside enclosed carriages.In this colo...