you know, there was a -- he was right in the center of what scientists call the real danger zone for fatigue. >> you heard earl weener, the ntsb investigator, say at the briefing that as far as the technology required to make sure these kinds of accidents don't occur, that technology is available to prevent derailments, prevent head of hn crashes if you will. for some reason, the technology is not on a popular route like this. why is that? is it simply a matter of money? >> well, well, it is partly a matter of money. you know, these commuter lines are borderline profitable operations. if that. many of them are subsidized. but it's awfully complex, positive train control. in europe, you have monopolies that are on the rail lines. so you have one operator, one type of equipment. on the hudson valley line, you have amtrak, you have metro