The London Fire Brigade said 14 engines were used to tackle the grass fire, near Lea Road in Waltham Abbey, which is near Waltham Cross.
Just after 17:00 it said the fire was now under control.
The LFB reported that at the height of the fire, about 14 hectares (35 acres) of grassland was alight. Crews used water backpacks and wildfire beaters to tackle it.
Greater Anglia also said Network Rail officers were on site, “working as quickly as possible” to help restore train services to normal.
Smoke has also affected traffic on the M25, the fire service said, with National Highways adding, one lane of the anti-clockwise carriageway between Enfield and Waltham Abbey was shut for investigation and repairs due to the fire.
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