DIN EN 16704-2-1:2014-07

This document defines minimum functional and non-functional requirements for developing a Track Warning Systems (TWS) to warn persons during their work on or nearby the track about the approaching of trains or rail vehicles using acoustical and visual TWS-Signals. These systems may also be able to influence the approaching of trains and rail vehicles by stoppage function. This European Standard is applicable: - to systems, sub-systems and components within TWS, including those containing software; in particular; - to new TWS; - to new integrations of systems, sub-systems and components into existing TWS; - to modifications of TWS developed according to this standard. For single warning units (e. g. simple electrical horns) it is recommended to use this standard, too. This document does not deal with: - hazards during the installation of the TWS caused by trains or rail vehicles on the lines; - hazards caused by the improper use of TWS; - hazards caused by the improper behaviour of persons working on or nearby the track; - CO2-tyfone, human operated pressure signal horns, flags, detonators or machine warning systems according to UIC 644; - national safety regulations to plan and operate TWS in track.