This guideline has been produced under licence to the Rail Safety and Standards Board (UK) (RSSB) to help rail transport operators identify the Safety Performance Indicators (SPIs) (also known as Key Performance Indicators) that are most appropriate to their operations and to ensure their continued effectiveness.

It is based on research undertaken by the United Kingdom rail industry and established good practice detailed in HSG2541 (Health and Safety Executive UK) and by the Organisation for Economic Cooperation and Development (OECD)2.