NIGHTENHELSER, STUART B.

Wolf Technical Services, Inc.

6828 Hawthorn Park Drive

Indianapolis, Indiana 46220

(317) 842-6075

(800) 783-9653

Fax: (317) 842-6974

E-Mail: stuartb@wolftechnical.com

Consultant. Expertise includes investigation of railroad accidents as well as visibility and lighting issues. Experience in accident investigation encompasses grade crossing accidents, railroad yard accidents, train braking and stopping distance issues. Strong physics and optics background encompasses night-time visibility, lighting evaluation and measurement, human vision, glare and visual obstruction of sight triangles at crossings. Advisory Board Member and Executive Vice President -NARSCI.