The engineer of the New Jersey Transit train that crashed into Hoboken Terminal on Thursday, killing one person and injuring more than 100 others during the busy morning commute, felt well rested and was unaware of any mechanical problems in the moments before the accident, federal investigators said on Sunday. At a news conference in Hoboken, officials from the National Transportation Safety Board said they had interviewed the engineer, Thomas Gallagher, as well as the train’s conductor, who was not identified, and still were no closer to determining the cause of the crash. It was the first fatal accident on...