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
More teacher strikes looming in Seattle, Spokane Ex-officer gets jail, house arrest for child porn on phone To protect killer whales, patrols keep boaters in check No charges against officer in Olympia police shooting Largest Washington wildfire is 45 percent contained 6 sickened in King County by E coli linked to food truck 3 violent deaths in Eugene-Springfield area since Friday Vancouver police dog dies after stabbing in confrontation
Our new comment system is not supported in IE 7. Please upgrade your browser here.