The Bombardier Horizon Passenger Car is a single-level model rail car that was built for Amtrak from 1988-1990. The Horizon is based on Bombardier's Comet Series of passengers cars that is currently used by several commuter rail agencies, specifically the Comet II. The Horizons began revenue service on Amtrak in April 1989. The Horizon cars are primary used on Amtrak's Midwestern Corridor trains which are based out of Chicago, Illinois. The trains are the Carl Sandburg, Illini, Illinois Zephyr, Lincoln Service, Saluki, Blue Water, Wolverine, Hiawatha, Hoosier State, and the Missouri River Runner. Amtrak also several Horizon cars based in California which operate on the Pacific Surfliner. In addition, the California Department of Transportation (Caltrans) is currently leasing and has refurbished three "dinette cars" for use on the San Joaquin route which coincideds with the purchase and refurbishment of 14 Comet IB cars from New Jersey Transit also used on the San Joaquin. A total of 104 Horizon cars were manufactured and come in two main configurations, Coach and Food Service Cars. Amtrak currently has 77 coach cars numbering 54000, 54500-54584 and 12 Food Service cars numbering 53505, 53511, 58000, 58002, 58004, 58006, 58007, 58103, 58104, and 58106-58108. Caltrans's cars are numbered 53501, 53509, and 53510. Horizon #54000 in Amtrak service on the Pacific Surfliner, credit goes to Geno Dailey. Horizon Dinette Car #53510 'Western Horizon' in Caltrans service on the San Joaquin, credit goes to Flickr user redfusee. The interior of a typical Horizon Coach car, credit goes to David Wilson.