Commuters face more nightmare journeys across London as the Northern Line is to remain closed following Sunday's derailment at Camden.

Rail replacement bus services are still ferrying Tube passengers between Golders Green and Charing Cross, and East Finchley and King's Cross. An extra service has also been laid on between East Finchley and Bounds Green.

Passengers faced long queues as the buses negotiated their way slowly through already congested traffic and stopped at every Tube station on the way. But it remains uncertain how long the disruption would continue.

After the Chancery Lane derailment in January, the Central Line remained closed for three months.

On Monday, there were four Tube trains operating between Edgware and Golders Green, and another four between High Barnet and East Finchley, operating in eight-minute intervals. Passengers then had to catch a bus to central London.

The replacement bus service at Golders Green station caused gridlock all morning as the sheer number of vehicles jostled to get in and out of the station forecourt.

A London Buses official said: "Golders Green [bus station] is so small, the area is so congested. We have got so many buses going in there, National Express and all the privatised companies, it's just too small to fit those buses.

"The train passengers will be happy to see all those buses, but the local people I don't think will be happy."

But passengers were not happy they had to leave the trains to get on a bus.

Steven Blackery from Holloway had left his coach at Golders Green to pick up the Northern Line when he could have stayed on the coach to Victoria. "I'm very angry about it actually. No-one told me there was a problem. I've just got off a direct coach to get on a slow bus."

The derailment happened on Sunday morning when the last carriage of a High Barnet train came off the track as it pulled into Camden Town station at around 10.30am. Seven passengers were injured and taken to the Royal Free Hospital in Hampstead. Five had been discharged by Monday morning. It is not yet known what caused the derailment.