摘要: |
As its surname indicates, Light Rail Transit (LRT) is a transit mode. Its middle name reflects that fact that it runs on rails. Why is it called light. That depends on who and where you ask. In Britain the term light railway is applied to any rail mode that is scaled down from the common size of mainline railroads. In previous years, even some of the lines that operated short freight trains pulled by diminutive steam locomotives were classified as light railways. It was not until the 1970s that the term light rail transit came into use in the United States. There was no formal definition of LRT at that time, but it was generally understood to mean an urban rail transit form that was leaner and less costly than other rail modes. A formal definition was adopted in 1989 and placed in the Transportation Research Boards Urban Public Transportation Glossary: A metropolitan electric railway system characterized by its ability to operate single cars or short trains along exclusive rights-of-way at ground level, on aerial structures, in subways, or occasionally, in streets and to board and discharge passengers at track or car floor level. The purpose of this informational booklet is to provide an understanding of this increasingly popular transit mode, with particular emphasis on its application in North American metropolitan areas, and to address the background of LRTs characteristics and capabilities. |