A man was rescued from the tracks at a Washington Metro station after his wheelchair rolled off the platform.Surveillance video shows two bystanders jumping onto the tracks to liftthe man and his wheelchair back onto the platform Tuesday afternoon atthe U Street station. A Metro spokesman says the nearest train was threestops away when the bystanders jumped onto the tracks.Metro says the man who fell had a bloody mouth but no other visibleinjuries. He was taken to a hospital for treatment. It wasn't clear whythe man's motorized wheelchair rolled off the platform.Metro spokesman Dan Stessel says the man who fell was not in imminentdanger of being struck by a train, but the greater danger was from theelectrified third rail.