This European Standard specifies the requirements for the design, dimensions, performance and testing of single/double brake indicators. It applies to pneumatically and electrically operating brake indicators visible from the outside of the vehicle. NOTE 1 Brake indicators are for giving precise and accurate information about release and application of the brake. This European Standard applies to brake indicators on railway vehicles used on the main national networks, urban networks, underground railways, trams and private networks (regional railways, company railways etc.). NOTE 2 This document does not apply to brake indicator for magnetic track brake or eddy current brake.