Code of Federal Regulations Title 49. Transportation § 49.234.311 ENS sign placement and maintenance

(i) At a farm grade crossing, the responsible railroad shall place and maintain a minimum of one sign that conforms to § 234.309 at the crossing.

(ii) At a railroad yard, or a port or dock facility that does not meet the definition of “plant railroad” in § 234.5, the responsible railroad shall place and maintain a minimum of one sign at each vehicular entrance to the yard, or the port or dock facility in accordance with § 234.309, in lieu of placing signs at each crossing within the yard, or the port or dock facility. Each sign must be placed so that it is clearly visible to a driver of a motor vehicle located at the vehicular entrance to the yard, or the port or dock facility.

(i) Is conspicuous to users of the roadway or pathway by day and night;

(ii) Does not obstruct any other sign or traffic control device at the crossing;

(iii) Does not limit the view of a train approaching the highway-rail or pathway grade crossing;  and

(iv) If mounted on a post, has supports that are crashworthy (i.e., breakaway or yielding).