restrictions including around a curve. and there are less sophisticated train control systems that don't automatic will he enforce the proper speed. i'm not cheer which signal control system was in useful whether they were using the automatic system or this was one where it depends on an employee complying with the rules. >> the bottom line is, speeds, we don't know. that fits to you. >>? right. the prime minister said this correctly, you don't jump to conclusions. you don't make any conclusions. you work from a process of elimination. clearly this speed has a very important part to play in this derailment. >> 118 versus a 50-mile-an-hour speed limit. it certainly seem that way. that video has been impossible not to watch. a prominent doctor was found dead and police say she was murdered. mark zuckerberg's stock rose