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The bullet motif of steam locomotives opened the new era of streamlined trains (REF). The movement for efficiency in industrial vehicle design had promoted the exterior outcomes that are not only aesthetically futuristic but also functionally superior (REF). The corpus, so called streamlined trains, was formatted by this design trend appeared in the market as a new locomotive design solution (REF). This international movement was an opportunity that made possible to commercially operate streamlined locomotives in many countries of Europe, America, and Asia (REF). In the level of brand, various manufacturers designed streamlined locomotives and they released these into the market. This trend could be a starting point of the long-term evolution of a streamlined nose – the front head of a train – shape because the design concept was a symbolic representation of futuristic modern identity. In addition, it was functionally suitable to deal with exponentially growing demand for long-distance transportation (REF). Fortunately, there were many technical supports; the fluid dynamics contributed outstanding portion at the transition of locomotive nose exterior design (Hucho, 1998). Technical knowledge gained through manufacturing fighters and commercial airplanes had made a foundation to design an exterior shape that would reduce aero resistance (REF). The design method of streamlined nose shape was developed at a time when aerodynamic designers were developing design methods and shape evaluation methods. After a long time, finally, the designers of a commercial locomotive could break the barrier of 200km/h with the new locomotive The Evolutionary Changes of the Streamlined High-speed Locomotives The quantitative analysis to reveal the changes of bullet motif locomotive design criteria

The Evolutionary Changes of the Streamlined High-speed Locomotives: The quantitative analysis to reveal the changes of bullet motif locomotive design criteria