Indiana Code Title 8. Utilities and Transportation § 8-8-3-1

Sec. 1. In addition to the powers granted the Indiana department of transportation in other statutes, the department shall investigate whether or not locomotive engines are constructed and built so that the engineer and fireman employed and working thereon and operating the locomotive engine are, at all times when operating the locomotive engine, in plain view and sight of each other and so situated and located in the performance of their duties that when so at work, engaged in operating and running the locomotive engines, there are no walls, partitions, machinery, parts, or appliances of the engine or other obstructions to prevent the fireman and engineer from readily, quickly, and easily seeing and communicating with each other.