An investigation is under way following a Tube train derailment on the Northern Line in north London.
The Tube had been travelling slowly
London Underground (LU) said the train ran into sidings near Archway just after 1100 BST on Friday in what they described as a "minor incident".
An LU spokeswoman said the slow-moving train was not carrying passengers and the driver escaped without injury.
Services have been partly suspended between Camden Town and East Finchley and replacement buses are now running.
A London Underground spokeswoman said: "An empty Northern Line train derailed at very low speed as it entered Archway sidings this morning."
She added that the derailment held up some trains carrying passengers.
Emergency services were called to the scene.