Colossus at the California theme park caught fire around 1:45 p.m., the Los Angeles County Fire Department said. The roller coaster has been closed since August.
Colossus, the 125-foot-tall wooden roller coaster at Six Flags Magic Mountain, caught fire Monday afternoon.
The roller coaster has been closed since August as the Valenica, California, theme park revamps it with a new, twisted steel track.
Twisted Colossus was scheduled to open next year.