Kidding!

Via @Jazzyfeldzle @unsuckdcmetro never a dull moment aboard @metroopensdoors #dc http://plixi.com/p/72441727

Turns out it was just smoke:

@metroopensdoors Further investigation found there was no fire onboard the train; smoke onboard was caused by a brake malfunction.

and:

@metroopensdoors As of 4:05 p.m. the Forest Glen and Wheaton Metrorail stations have reopened and normal service has resumed on the Red Line.