time since the derailment last week. as the investigation continues, many gathered for a moment of reflection. a short distance from the crash site to honor the dead and wounded, a bell tolled as philadelphia's mayor read the names of the eight people killed. >> let us recognize we still have many patients in the hospital. we have families who are burying loved ones. today is about respect for all of them. >> the automatic control system, that's technology that could stop a speeding train is now fully operational on the northbound tracks where the accident happened. >> and turning to the stormy weather, it was a rough weekend for the central plains. south of fort worth, texas, emergency personnel used unmanned drone to get a rescue line to a family surrounded by floodwaters. a national guard helicopter then flew them to safety. there were a dozen other water rescues in that area from both vehicles and homes.