AT&SF was widely known for its passenger train service in the first half of the 20th century. AT&SF introduced many innovations in passenger rail travel, among these the "Pleasure Domes" of the "Super Chief" (billed as the ""...only dome car between Chicago and Los Angeles"" when they were introduced in 1951) and the "Big Dome" Lounge cars and double-decker Hi-Level cars of the "El Capitan", which entered revenue service in 1954. The railroad was among the first to add dining cars to its passenger trains, a move which began in 1891, following the examples of the Northern Pacific and Union Pacific railroads. The AT&SF offered food on board in a dining car or at one of the many Harvey House restaurants that were strategically located throughout the system.