projectile went through the windshield that night. engineers call this getting rocked. it happens so often along the northeast corridor that they actually protect themselves with grills in the front windshield so they don t get hit with projectile projectiles. the federal railroad administration ordering amtrak over the weekend to make changes. going into that turn only 45 miles per hour and also post signs along the route for speed limits. and finally, mayor nutter yesterday holding an emotional ceremony here in philadelphia to remember the eight people who lost their lives on that night. he was here this morning at the 30th street station seeing people off on their way to new york. here s what he had to say. whatever folks might be thinking, obviously, they have booked themselves on this train. everyone knows, certainly, what has happened, but just a sense of reassurance for the first train going out that things are safe secure, you should feel comfortable. reporter: 20 people re