By Loretta Fulton The head of Trinity Industries, Inc., headquartered in Dallas, will be the guest speaker for the Oct. 6 Fletcher Lecture Series at Hardin-Simmons University. Jean Savage is president and chief executive officer of Trinity Industries, which owns businesses that provide railcar products in North America under the trade name TrinityRail®.  Savage will speak at 11:30 a.m. Tuesday,