metro north crash north of manhattan where the tired train conductor zoned out and four people died. and what happened in philadelphia, for some reason heading into that 50-mile-an hour curve that train was being driven at over 100 miles an hour. the cars flung off the rails. yeah positive train control would have prevented this crash too. but the system is not in place yet. amtrak has been slowly getting that system in place piece by piece, doing this here and that there. they have positive train control on on some of the tracks but not in philly where the plane crash happened last night. and so all of those people died. >> it is not installed for this area where the accident occurred, where the derailment occurred. that type of a system we call