North Wales Narrow Gauge Railways
The North Wales Narrow Gauge Railways (NWNGR) was a railway company that planned to build a number of inter-connected 1 ft 11+1⁄2 in (597 mm) narrow-gauge railways across North Wales. The first two of these lines – jointly known as the "Moel Tryfan Undertaking" – were authorised by act of Parliament, the North Wales Narrow Gauge Railways Act 1872 (35 & 36 Vict.
Source: Wikipedia — North Wales Narrow Gauge Railways (CC BY-SA 4.0)