Image source, SuppliedImage caption, Trains that were meant to stop at Waltham Cross (pictured) were instead diverted to Seven Sisters
Some trains running to and from London Liverpool Street station have been stopped following multiple trackside fires.
At 14:57 BST, Greater Anglia reported a fire at Waltham Cross in Hertfordshire meant all trains had been halted on one line.
The rail operator said London Fire Brigade asked trains to be stopped because of multiple fires close to the railway lines.
Services to and from Stansted Airport in Essex, Cambridge North, Meridian Water in Hertfordshire and Hertford East were all affected.
Image source, SuppliedImage caption, The smoke could be seen by people travelling on the M25 (picture taken by a car passenger)
Further trains would be delayed, cancelled or diverted via Seven Sisters, a spokesperson added.
London Fire Brigade said 14 engines were being used to tackle a grass fire, near Lea Road in Waltham Abbey, which is close by.
It is unclear whether this is a separate blaze and the BBC has asked the service how many incidents it is dealing with in the area.
Greater Anglia also said Network Rail officers were on site, "working as quickly as possible" to help restore train services to normal.
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