Based on the analysis of application modes of geographic information system (GIS), the basic
idea and characteristics of three-tiered architecture were presented, and an integrated application model for
railwayGIS was proposed based on three-tiered architecture. Furthermore, the whole planning of railway
GIS based on three-tiered architecture technologies was disscussed. An application system of railway GIS
was developed usingMapObjects and C++Builder, and this system characterizes high efficiency, stability
and expansibility. The application result shows that it is feasible to apply three-tiered distributed technique
to railway GIS.