巴黎—东南线的平纵断面特性完全不同于其他任何一条铁路。该线是专为高速旅客列车而设计的。它的安全程度起码应不低于普通线路,而且还应尽量降低陡坡地段的工程费。 开始设计时,根据法国的技术知识状况,按300km/h左右的速度设计,只是在后来 The flat-profile profile of the Paris-Southeast line is completely different from any other railroad. This line is designed for high-speed passenger trains. Its security level should be no less than ordinary lines, but also should try to reduce the cost of construction on the steep slopes. At the beginning of the design, according to the French state of knowledge of technology, according to the speed of about 300km / h design, but later