so we have called for positive train control for many many years. it's on our most wanted list. congress has mandated that it be installed by the end of this year. so were very keen on positive train control. we feel that had such a system been installed in this section of track, this accident would not have occurred. [ inaudible question ] is this train equipped with a dead man switch? some have it, some don't. oftentimes in place of the dead man switch they have an alerter. if there's no activity from the engineer within a certain period of time, their oral and visual alerter will activate in the cab of the locomotive and if an engineer makes a throttle movement or something, that will deactivate. we want to know exactly what was