Transit police

Transit police (also known as transport police, railway police, railroad police and several other terms) are specialized police agencies employed either by a common carrier, such as a transit district, railway, railroad, bus line, or another mass transit provider or municipality, county, district, or state.

Transit law enforcement services may also be provided by a specialized unit within a larger local law enforcement agency. Their mandate is generally to prevent and investigate all crime committed against the carrier or its passengers and crime incidentally committed on or around the carrier's property.