【摘要】 本文在现有铁路客车车顶断面几何形状二段弧设计的基础上，根据我国铁道车辆生产的实际情况从理论上探讨了在既定条件下铁路客车车顶断面几何形状的三段弧设计问题，进而给出了可行解的范围和设计步骤，为我国铁路客车设计解决了一个难题。更多还原

【Abstract】 Based on the existing geometry design of the roof section of passenger train with2-arcs,according to the practical state on product of passenger train in our country,this paper probes theoretically into the problem of geometry design of the roof section of passengertrain with 3-arcs under the specific conditions.Then the designable range and the designsteps have been given,and we have resolved a key difficult problem for the designer of passenger trains.更多还原