By Zack Colman | 07/23/14 03:14 PM
The effort is a response to a number of recent derailments and explosions that have increased partly because of booming oil production in the Bakken shale formation in North Dakota and Montana.
By Paul Bedard | 07/30/14
By Associated Press | 07/31/14
By Byron York | 07/31/14
By Ashe Schow | 07/31/14