The Northern Line has been hit by severe delays following an earlier faulty train at Euston.
Severe delays are affecting southbound l services between Camden Town and Kennington, via Bank, on Monday morning.
It comes after the M25 in Surrey reopened early after the first planned daytime closure of the motorway over the weekend.
A five-mile stretch between junctions 10 and 11 closed in both directions at 9pm on Friday and was due to open at around 6am on Monday.
However, following works to demolish a bridge and install a huge gantry, it reopened at just after 10pm on Sunday. An 11.5-mile diversion route was created to direct traffic along A roads that caused severe disruption, however traffic jams were not as bad as many feared.
