A signal indication that requires an approaching train to come to a complete stop before passing it. The term is most commonly used in the phrase "at danger" to describe a red board or an equivalent restrictive aspect. Operating rules dictate strict procedures for passing a signal in this state, usually requiring verbal permission from a dispatcher.
Heard on the job
Dispatcher, we're stopped at the home signal at danger, over.
Insider tip
Crews rarely say 'danger' on the radio in North America, preferring 'stop indication' or simply 'red board'.