This document highlights the complex nature of rail suicide data collected from international peer-reviewed articles, and from the United States. The purpose of this effort is to identify the types of rail suicide data that exist, and to understand how they can be used to develop and select effective mitigation and prevention strategies. This research will benefit the Federal Railroad Administration (FRA), railroads, researchers, and other stakeholders. This work was performed under interagency agreements between FRA’s Office of Research, Development & Technology’s Human Factors Division and the Volpe National Transportation Systems Center’s (Volpe) Human Factors Division.