Spokeswoman Kimberly Reason says the cause of the fire is under investigation but it could have been caused by frozen brakes that overheated.
The driver noticed a problem, pulled over and safely evacuated about 70 passengers, including a woman in a wheelchair.
Reason says there’s no official estimate of the loss, but the bus costs nearly $700,000 new.
Flames gutted the diesel-powered articulated bus and it burned for more than half an hour as Seattle firefighters poured on water and foam.
The Transportation Department says the fire at North 85th Street backed up morning rush hour traffic for 10 miles.
More Northwest Headlines
Oregon gunman killed himself after police shot him US judge declines to undo government order on green cards Seattle officer fired for obstructing investigation Alaska hired consultants ahead of Obama visit State ferries selling 9 generators it bought but never used Portland to recognize Indigenous Peoples Day Threat causes Southern Oregon University to cancel classes EPA rushed to judgment in blocking Alaskan gold mine, report suggests
Our new comment system is not supported in IE 7. Please upgrade your browser here.