(rail transport) An instance where a train must stop at a red signal, or slow down before passing a signal displaying a yellow aspect.

plural of danger-signal

A city in Los Angeles County, California, United States.

(rail transport) A device in the cab of a locomotive or train which displays the status of signals along the track.

plural of cab signal

plural of somersault signal

(rail transport) A semaphore railway signal that is pivoted in the centre of its arm.

plural of signal lad

(rail transport, UK) A young man employed in a signalbox to record the times of trains as they pass through the area served by the signalbox.

plural of signal fire