Nervously, he ran along the platform to its end and pulled the mechanism that set a stop signal.

These are a special type of signal, a go or a stop signal.

A stop signal comprises a red arm with a square end and a white band.

A particular signal box may control one or more stop signals on each running line.

He moved down the street, to a stop signal.

They came to an intersection with a stop signal.

An investigation later determined that one of the engineers had run through a stop signal.

If it did, however, central bank intervention would become necessary to send out a stop signal.

On 26 September 1908, a train driver missed a stop signal.

Then before she could answer, he held up his hand in a "stop" signal.