This European Standard is applicable by authorities involved in railway operation and may also be applied for light vehicles (e.g. trams, metros, etc. running on two rails) and their associated infrastructure, but not for systems such as rail-guided buses
DS/EN 15273-1:2013 history
2013DS/EN 15273-1:2013 Railway applications - Gauges - Part 1: General - Common rules for infrastructure and rolling stock