Unexplained , intermittent failures persist despite repairs , Metro official says . Passenger hears loud noises , ` ` accordion - like '' collapse of floor , screams . Passenger chides Metro for making high - speed , ` ` impossible '' possible . 9 people killed , 20 injured in June 22 crash near Red Line 's Fort Totten station .
Unexplained , intermittent failures persist despite repairs , Metro official says . Passenger recalls loud bang , `` accordion-like '' collapse of floor , screams . Delegate chides NTSB for making high-cost , `` impossible '' recommendations . 9 people killed , scores injured in June 22 crash near Red Line 's Fort Totten station .