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In this study, a concept of a hybrid bodyshell for a tilting train is proposed and a prototype model has been developed. Tilting trains require lightweight structure and stability on curves. To satisfy these requirements, the upper bodyshell of the prototype model was made of composite honeycomb panels and the lower underframe of stainless steel. The composite honeycomb panel was composed of carbon fiber reinforced skins and an aluminum honeycomb core. The hybrid structure made it possible to reduce the carbody weight by almost 30 per cent. The hybrid bodyshell was tested for the static and fatigue strength and fire safety was also verified by testing. The hybrid bodyshell was proved to be good enough for commercial use. As a result, the conventional manufacturing process for the rolling stock could be changed by introduction of this new structure.

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The Korea High-Speed Train (KHST) is complete and ready for commercial service. In preparation for commercial service, the reliability of the KHST was proven. In this article, a practical procedure is proposed to assess and manage the reliability of the prototype train traction system. The past data of a similar traction system are analysed in order to set the reliability target. The effectiveness of the procedure for reliability growth is shown. After the electric traction system is classified into subsystems, reliability analysis is carried out. Reliability block diagram and failure mode effect analyses are performed. The expressions for calculating the reliability are deduced and the mean kilometres between service failures are calculated using the previous failure rate data. Some practical criteria for the demonstration of reliability are proposed. Reliability growth is shown using a test run on a commercial line.

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