Tribune photo illustration

Chicago Tribune photo illustration (Nancy Stone / Chicago Tribune / February 7, 2012)

A small fire on CTA"L” tracks caused a brief delay along the Red, Brown and Purple Lines this afternoon on the North Side.

No one was injured and normal service was restored as of 4:40 p.m.

Firefighters were called to the tracks on the 900 block of West Diversey Parkway at 4:14 p.m., said Chicago Fire Department spokesman Meg Ahlheim.

A smoldering rail tie caused the power to be turned off in both directions at 4:25 p.m., affecting the Belmont, Wellington, and Diversey stations, said CTA spokeswoman Catherine Hosinski.

The fire involved rubbish and was extinguished at 4:37 p.m., said Ahlheim, who added that no one was hurt.

Power was restored and normal service resumed at 4:40 p.m., according to Hosinski.

Riders on the Brown, Red and Purple Lines experienced delays.

chicagobreaking@tribune.com

Twitter:@chicagobreaking