This article was reproduced with the kind permission
of the British Broadcasting Corporation
21 November 2007, 07:59 GMT
The road was closed between the Redbridge and Greenman roundabouts, after the bus became stuck to the ground at about 2330 GMT on Tuesday.
Police said one lane has reopened but the inside lane will remain closed.
No-one was injured as the bus was empty and returning to its garage. The fire is not being treated as suspicious.
No other vehicles were involved.
Scotland Yard said the road was closed following the fire, which has been extinguished, while the bus was being removed. A large diesel spillage is being cleared up and the road will need resurfacing.
The London Fire Brigade and London Ambulance Service were at the scene.