There are delays on several tube lines and problems on the London Overground this morning.
No service between Surrey Quays and Clapham Junction and between Willesden Junction and Richmond to due to the adverse weather conditions.
No service between Shepherds Bush and Willesden Junction and Richmond and Willesden Junction because of a faulty train at Willesden Junction.
Minor delays on the rest of the line.
He has made no secret of the fact he wants to take over every rail service in London -- and today the government appeared to back Boris Johnson's plans.
The Transport Secretary Patrick McCloughlin told London Tonight he had 'no objection in principal', to the Mayor of London having power over rail franchises.
He pledged his support as Mr Johnson officially opened a new route on the London overground service.
Our Political Correspondent Simon Harris has the story.
128 years after the circle line was completed, the capital now has a new orbital railway.
The final section of the London Overground - between Clapham Junction and Surrey Quays - has been completed and the line now runs in a full circle around the capital.
Today, the Mayor Boris Johnson climbed aboard for the official launch, joined by our Political Correspondent Simon Harris.
The Mayor will be trying out the new east London Overground extension this morning.
The new line from Clapham Junction to Surrey Quays, marks the completion of a £1.5 billion project to create an orbital service circling the whole of the capital.
Severe delays on London Overground between West Croydon and Highbury and Islington due to earlier trespass incident at Forest Hill.
Services are subject to delays and cancellation. Also affecting Southern services.