actually, we think that there is an option that is even brern have better than having a second person. and that's positive train control. it's designed to protect against human error. if the error occurs, positive train control will kick in and control the speed of the train sgrp. >> we've been talking about that and apparently it was installed on metro north trains after people a died. so until we're up to speed technologically, doesn't it make sense to have two people up front? >> well, we've certainly seen accidents where there are two people in either an airplane or a locomotive cab. so, yes we do want redundancy and another person may be a measure of redid doneundanceyredundancy. but positive train control is a proven technology. s's required to be installed by the end of this year. >> and robert, this is willie geist. this is not a new technology, is it?