Fast food restaurants are designed to be streamlined, like the dining car of a train, reminiscent of the luxurious interior decoration of the new train. These most American fast food restaurants provide cheap food, adopt new materials, have sleek and smooth shapes and decorative patterns with expressive speed, and their appearances are decorated with long and parallel aluminum bars, chrome bars or colored bars, showing a more streamlined state, just like those seen on the bodies of many locomotives, buses and cars. The purpose of this is to let customers see the cars shuttling on the highway, and fast food restaurants can still remind them of the speed. Speed is regarded as a symbol of modernization, which can be felt from the advertising pictures that juxtapose train dining car fast food restaurants with trains and planes.