An urgent investigation is underway after an Amtrak train collided with a water truck, jolting all eight cars off the track in Ventura County, California. SUBSCRIBE to ABC News on YouTube: bit.ly/2vZb6yP Latest updates: abcnews.go.com Watch FULL EPISODES on Hulu: abcn.ws/3bzvQQn #amtrak #derailment #trains #abcnews