Meter gauge
A metre gauge railway is a narrow gauge railway or tramway with a track gauge of 1,000 mm (3 ft 3 3⁄8 in). It is used in around 95,000 kilometres (59,000 mi) of tracks around the world. Historically it was utilized by European colonial powers such as the French, British, and German empires. In Europe, large metre gauge networks remain in use in Switzerland, northern Spain and in many European towns with urban trams, although most metre gauge local railways in France, Germany, and Belgium closed down in the mid-20th century. With the revival of urban rail transport, metre gauge light metros were established in some cities, while in other cities metre gauge was replaced by standard gauge.
...
Wikipedia