Trains are set to be cancelled, delayed or revised, due to a broken down freight train between Finsbury Park and Hertford North.
Disruption is expected to continue until 9am as the northbound line through Bowes Park is currently blocked.
There will be no direct service from Alexandra Palace via the Gordon Hill and Hertford North areas. Trains will either be cancelled or run non-stop from Alexandra Palace to Stevenage.
Services continue to run southbound, however some congestion in the area is causing further delays.
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