Who'd 've thunk it?
A Network Rail spokesman said: "During the process of testing the complex signalling, we identified an issue in this safety-critical system which we are working to resolve.
"This will take some time to fix and a small number of early passenger trains may be delayed as a result.
"We are working hard to minimise delays to passengers, but safely is our number one priority."
"This will take some time to fix and a small number of early passenger trains may be delayed as a result.
"We are working hard to minimise delays to passengers, but safely is our number one priority."
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