Wiktionary
signal boxes
n. (signal box English)
Usage examples of "signal boxes".
In the last few months, from his base in Paris, he had ranged all over northern France, barking at sleepy sentries and putting the fear of God into lazy captains, tightening up security at railway signal boxes, train sheds, vehicle parks, and airfield control towers.
All round the track, and on all the stations and signal boxes and in the signals themselves, tiny electric lights suddenly shone out.
It was an extraordinary place, with shelf after shelf of books, all with titles like Railways of the Winion Valley and Maivddach Estuary and The Complete Encyclopaedia of Signal Boxes.