Metre gauge is the system of
narrow gauge railways and
tramways with a
track gauge of . It has installations of around in the world. It is the main gauge in some countries. In Europe large metre gauge networks remain in continuous use in Switzerland, northern Spain and for many
European 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, in some cities metre gauge
light metros were established, while in other cities metre gauge was replaced by
standard gauge.