Railroad police or railway police are people responsible for the protection of railroad properties, facilities, revenue, equipment, and personnel, as well as carried passengers and cargo. Railroad police may also patrol public rail transit systems.
An example from Canada - Edmonton Transit Peace Officer Ford Crown Victoria Police Interceptor
Allan Pinkerton (left) began the first railroad police in the U.S. at the urging of Abraham Lincoln (center) when the future president was a lawyer for the Illinois Central Railroad.
An Amtrak Police SUV
British Transport Police is a national special police force that polices the railway network of England, Wales and Scotland. The force polices more than 10,000 miles of track and more than 3,000 stations and depots.
BTP officers patrolling with dogs at Waterloo station
BTP Police station "blue lamp"
BTP Ford Kuga response vehicle, seen next to a Vauxhall Astra response vehicle, at Maidstone West railway station
A bilingual sign in Welsh and English