Marylebone station shut by fire, hitting Chiltern rail services
A cable fire in a tunnel near Marylebone has closed the central London railway station, affecting Chiltern Line services.
The "serious fire" broke out in St John's Wood tunnel at about 02:30 BST.
About two metres of signalling cable was damaged and the signalling system is not working, Network Rail said.
Chiltern Railways said Marylebone would remain closed on Monday, as repair work continues overnight, and services on Tuesday could be affected.
The rail operator said: "Damage from the signal cable fire was more extensive than first thought and repair work will need to continue overnight.
"Due to the severity of the damage, repair works may affect the morning of Tuesday 17 June."
There is a restricted service on the Chiltern Line, which said tickets would be valid on other mainline services and the Underground.
Normal services cannot resume until new cables are installed and tested, Network Rail said.