ABSTRACT
Rail signalling requires the operator, or ‘signaller’, to have an accurate understanding of the state of the system that he or she controls, in order to make correct, timely decisions and take effective action.This understanding needs to include train, track, signal status and routes set. It also requires knowledge of the performance parameters that the system should be working within (e.g. the timetable), local and geographical factors that might impact regulation, knowledge of any system failures or restrictions and, where appropriate, what decisions any automation may be making. Broadly, this understanding can be referred to as ‘Situation Awareness’.
