peter gols. the former inspector general at the u.s. department of transportation, mary skiauvo. they were explaining the people who will participate in this. this is the front car. the front car which turned into a battering ram which caused considerable damage to a pretty heavily constructed terminal. this is not, you know, this is not a small light building it went through. you see this damage here. i mean, if that's the first thing you saw as an investigator, what are you thinking? >> you're reminded of mary's statement. you can't violate the laws of physics. these trains are tremendously heavy. the engine is probably 60 tons alone. when you've got that kind of force moving, even if it's going in a relatively modest 20 miles an hour, it's going to produce a horrific accident and horrific accident scene and that's what we're looking at. >> i'm having notes handed -- we have some great producers on this story. raising the question of whether this will become a positive train control question, positive train control. the new jersey transit authority told it's not installed this