amtrak employees. one, the engineer of the train, michael campa, a 54-year-old from georgia, as well as the conductor, michael sella from florida. the ntsb is leading this investigation, and we're just leading from a source who has direct contact with this investigation saying investigators are focusing on the signal systems along the roadw railway and whether they were working properly. we heard from the governor who gave us more insight into what could have gone wrong. >> it appears to me that the csx was on the track that it was supposed to be on, and that appears to be a loading track or a switch track. amtrak was on the wrong -- they weren't supposed to be meeting right then by the bridge, clearly. and it may be a time factor, but that's what it appears to me.