J
- JARUS
- Joint Authorities for Rulemaking on Unmanned Systems
- Jetty
- Structure extending into water used as a landing stage
- Junction
- A place at which two or more rail routes converge or diverge.
- Junction points
- A track component that provides a path for a wheel to transfer from one track to another.
- Just culture
- A just culture is a safety culture that promotes accountability and fairness. It encourages people to report errors and share information, without fear of blame or retribution, in order to improve safety performance. Globally, many safety-critical industries, such as aviation, maritime, oil and gas. and healthcare, promote just culture.