Amtrak, also known as National Railroad Passenger Corporation, is a provider of intercity passenger rail services to more than 500 destinations in over 45 U.S. states and nearly two Canadian provinces. Operational since 1971, the company operates a approximately 20,000-mile route system. It has designed positive train control systems that assure rail safety by enforcing maximum authorized speeds, speed restrictions and stop signals. Amtrak maintains a fleet of coaches, electric and diesel locomotives, cars and nonpassenger equipment. The company also operates a system of buses, vans, taxi shuttles and boats that links passengers to rail services. It additionally offers online reservation options.