Abstract：Abstract：Research purposes：As urban rail transit network backbone lines were constructed, the peripheral group or satellite city construction fast channel now were demanded, and the express/slow train organizationmode gradually began to be studied and applied in the urban rail transit. This kind of train organization mode can give full play to the economic benefits of rail transit, and also the transport capacity can also be used efficiently. But the express/slow train organization mode is complex, it would reduce the system capability to a certain extent, so it is necessary to analyze the system capability loss problem.
Research conclusions：Through the research, this paper draws the following conclusions: (1) The express train which does not stop at station，will save time about 1min (including idle stop time); (2) In the run chart based on traditional parallel paired, this paper put forward the express/slow train operation effect on system capacity loss formula; (3) The research results can provide the reference for research and implementation for city rail transit line scheme in future.
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