Here is what Network Rail says about signals and points and how faults are dealt with.

“Signals tell train drivers when it’s safe to go and what routes their trains will take.

“There are about 40,000 signals across the railway and a complete signalling system is complex with many more parts that work together.

“A signalling system collects all the information needed to tell drivers when it’s safe to move forward. So when our systems detect a problem, signals turn red automatically and stop trains running.

“Points, also called switches or turnouts, are devices that let trains move from one track to another at junctions. They’re essential for efficient railway operations, allowing trains to be directed in various directions.”