Signalling problems have resulted in a number of train delays today (Tuesday).
A problem near Gordon Hill means trains are not currently running between Alexandra Palace and Stevenage via Hertford North. Trains running through Hitchin are also seeing delays of up to 30 minutes.
Engineers are currently investigating the issue but are unable to provide any information on when the trains will resume their usual schedule.
Network Rail apologises for any inconvenience caused.
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