Even wire and rod signalling is now far more sophisticated than it might at first appear. It is not just levers, but other technology in the box itself.
But underneath those levers is the real sophistication. Here you would find what is, in effect, a computer system.
Even the humble semaphore signal is more clever that you might think. If the wire breaks, the signal will fall to the stop position ...
Even if the signalman is looking at the back of his signal, there is an arm which obscures or reveals a white light, again so that the signalman knows what indication the train driver will see.
Alas for the nostalgia-freaks, much of this is now done electronically with clever technology replacing the clever but crudely analogue systems.
Rail enthusiasts grieve at every disappearing box and weep as they are replaced by uninspiring portakabin type sheds.
fbb has a small signalbox at Peterville and it is currently undergoing a major change.
Thanks to No 2 grandson.