A signal box is the cabin from which signals and points are worked. Wave at the signal box.
The levers were heavy and their order was fixed so an unsafe route could not be set. A signal box has almost vanished, replaced by a handful of control centres.
1nounsignal boxThe cabin from which signals and points are worked.
“The signal box was manned by one person for sixty years.”
signal box is a cabin.
Practised in Railways