Today the Southern California passenger rail system Metrolink said it will install new safety measures on its trains. It's partly in response to a deadly crash in 2008 where a Metrolink train collided head-on with a freight train near Chatsworth, killing 25 people. 

Investigators found that the Metrolink train's engineer was fault because he was distracted at the time by texting. This new system is designed to monitor trains and, if necessary, correct human error.

Joseph Szabo, head of the Federal Rail Administration, joins us to explain more about the new technology.