What are some features of rail signalling control?

Controlling movement authority of trains Safety and operational performance (train seperation and running on time) Give the signaller oversight to a winde range of functions (signals, when technicians can go on lines,etc) A physical task that's becoming more cognitive (levers changing to buttons and screeens) An active task that's becomming more monitoring Their in control of Risk, Recovery and Defence; Signalers are last line of defnece, maintaining safety.