signal box
noun
,
British
1.
a railway signal tower.
Origin
1820-30
Examples from the web for
signal box
The live picture is linked to the traffic
signal box
.
British Dictionary definitions for
signal box
signal box
noun
1.
a building containing manually operated signal levers for all the railway lines in its section
2.
a control point for a large area of a railway system, operated electrically and semiautomatically