Wyo. Stat. § 37-9-1101: Injury or death of persons unlawfully riding on railroads; immunities.

Except in cases of attractive nuisance, no person owning, operating, loading or unloading a railroad car or train shall be liable for any damages for the accidental death or injury of a person occurring while the person was riding the railroad car or train in violation of W.S. 37-12-104, or while the person was boarding or unboarding from the railroad car or train without the consent of the owner or operator of the railroad car or train.