itself. was the system disabled on that particular locomotive? were these warning signals given and not responded to? we don't know the answers to those questions. >> george stay with me. paul i want to bring you in. when we talk about this locomotive black box, this locomotive event data recorder essentially that is the black box of these trains what specifically will investigators, what data will they be able to retrieve? >> okay. the black box for locomotives gives you exact position speed, gps location velocity and a number of the controls that are in the cab. that is how the throttle was set, were the brakes set, did he honk the horn activate the bell. there's a reverser and a power switch. all of this is recorded along