Reference
Library
Reference and learning material behind the safety quiz and training on this site.
GCOR Rulebook
General Code of Operating Rules, 9th Edition, 8.5 by 5.5 inch pocket version, the industry-standard rulebook this site's training is built on.
General Safety and Operating Rules
Industrial Rail Yard Safety, 71 rules with glossary. This is the source document behind the site's Railroad Safety and Operating Rules quiz.