Ind. Code § 8-6-6-1

Sec. 1. It is a Class C infraction for a person, or the lessee or receiver of any person, who owns or operates any line of steam or interurban railroad to run trains without installing and maintaining, at each grade crossing of its railroad with any public highway, railroad crossing signs (crossbucks) and number of tracks signs if required, placed at right angles with the highway, where possible. The construction of the signs and warning notice must be in conformance with the manual on uniform traffic control devices adopted under IC 9-21-2-1.