There are also PTC problems that need to be ironed out so that mistakes don't cause unnecessary delays http://www.latimes.com/local/california/la-me-metrolink-d

There are also PTC problems that need to be ironed out so that mistakes don't cause unnecessary delays http://www.latimes.com/local/california/la-me-metrolink-delays-20160201-story.html http://www.latimes.com/local/california/la-me-metrolink-dela...