From relay interlockings through to ETCS. How signalling keeps trains apart, how it fails, and where the human factors sit in safe operation.
Signalling exists to make one thing impossible: two trains in the same place. From relay interlockings through to ETCS, you cover how the safety logic achieves that, how systems fail safe, and where human factors quietly reintroduce the risk the engineering removed.
Aspects, blocks, headways, and the logic of safe train separation.
Relay and computer-based interlockings and how routes are proved and locked.
Track circuits, axle counters, and their strengths and failure behaviours.
ETCS levels, balises, and the migration from lineside signalling.
How signalling systems are engineered to fail to a safe state.
Signaller workload, degraded working, and communication in safe operation.
Signalling engineers, technicians, train control staff, and operations personnel responsible for safe train movement.
A rail operations, engineering or signalling background.
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