"Union Pacific Special Agents
Union Pacific has a police department staffed with more than 220 Special Agents. Special Agents have primary jurisdiction over crimes committed against the railroad. The department is responsible for all Union Pacific locations across 32,000 miles of track in 23 states. Its success has served as a model for national crime management; the U.S. Federal Bureau of Investigation’s creation in 1907 was closely tied to the Union Pacific Police Department’s approach.
Railroad police are certified state law enforcement officers with investigative and arrest powers both on and off railroad property in most states. They also have interstate law enforcement authority pursuant to federal law."
https://www.up.com/aboutup/community/safety/special_agents/index.htm