A vehicle hitting a level crossing at Enfield Lock means all lines are blocked.
Trains running between Cheshunt and Tottenham Hale may be cancelled, diverted via Seven Sisters or delayed by up to 10 minutes.
Disruption is expected until 09:30.
Stansted Express trains will be diverted to run via Seven Sisters and will not call at Tottenham Hale.
To assist you with your journey your ticket will be accepted on London Underground services via any reasonable route.
Stansted Express Travel Advice from Tottenham Hale:
Use the Victoria line to travel between Tottenham Hale and Seven Sisters, or travel on the first available train to Bishops Stortford and change for trains to Stansted Airport.
Additional Information:
Advance purchase tickets holders will be allowed to travel on earlier or later trains if their booked service is cancelled.
Check your next train and alternative options using the new live map.
Check before you travel:
You can check your journey using the National Rail Enquiries real-time Journey Planner.
Compensation:
You may be entitled to compensation if you experience a delay in completing your journey today. Please keep your train ticket and make a note of your journey, as both will be required to support any claim.