Camden Town station is open, but congestion is expected

But access to destinations is limited while the investigation continues into why a train derailed at Camden Town on 19 October.

The last carriage hit the tunnel wall as it came off the track at Camden, where the Northern Line separates into two branches.

London Underground (LU) says the junction has been "locked into two separate rail routes" - all High Barnet trains are running through Charing Cross, while all Edgware trains go through Bank.

Congestion is expected at Camden Town and Euston where passengers will need to switch branches, so LU is urging commuters to avoid boarding trains at those stations where possible.

The root cause of the Camden crash is still being investigated

LU managing director Tim O'Toole said: "I'm sorry that more of our passengers will now need to change trains to reach their destination.

"We will do all we can to ease any disruption to journeys."

Tube Lines, the consortium in charge of maintenance on the line, is still trying to find out why the train derailed.

The crash came two days after a derailment outside Hammersmith.

Union leaders are pressing ahead with plans to ballot Tube workers for a strike over safety.

Crisis talks aimed at preventing industrial action were held on Tuesday between representatives of the Rail, Maritime and Transport union (RMT) and managers.

Mr O'Toole promised to investigate all safety concerns raised by the unions and make changes to improve safety.

But after the summit union leaders said they "heard nothing" to stop them balloting members.

Ballot papers are due to go out this week to RMT members over possible strikes and "go slows" in the run-up to Christmas.