1. Directive (EU) 2016/798 on railway safety.
2. Directive (EU) 2004/49/EC on safety on the Community's railways.
3. Guidance on the Railways (Accident Investigation and Reporting). 2005. Available from Internet: https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/456936/guidance_to_rair_regs_v4.pdf.
4. ISO/IEC Guide 51:2014 Safety Aspect − Guidelines for their inclusion in standards.
5. European Commission Implementing Regulation (EU) 402/2013 on a common safety method for risk evaluation and assessment, 2013.