Abstract
The urban train system is known as an energy-efficient and environmentally-efficient public transportation system. In this study, we suggest the method of constructing spatially the most realistic CO2 emission inventory by using a bottom-up approach with actual traffic amounts of urban train. We also developed the energy efficiency and the environmental efficiency of urban trains and we compared them with the other transport system in Seoul. As a result, the urban train system was shown as highly energy-efficient and environmentally-efficient public transportation system. The energy efficiency of the urban trains of Seoul were calculated as 58 ~ 111 kcal/p∙km, which was about one-tenth of the level of sedans and one-fourth the level of busses. The environmental efficiency was calculated 12 ~ 22 gCO2/p∙km, which was about one-eighteenth the level of sedans and one-fifth the level of busses.
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