文档介绍：火车基本知识)
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the 5，最高速度250km/h（CRH1被做了手脚只跑200km/h是例外），在相应的无限长上坡道上可以达到的速度：
6‰——250km/h；
12‰——不小于200km/h；18‰——CRH1和CRH2约170~180km/h，CRH5约165km/h；
可知，在石太、宜万、渝利、贵广等限制坡度达18‰的线路上，A型动车仍然能达到很高的速度。实际线路中除了爬山路段，坡度不会连续这么
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
大，动车速度还能进一步提高；而且动车有强大的再生制动性能，下坡制动问题不大。可以说，新建线路中A型动车运行速度达到200km/h是很容易的。
第三节．列车通过曲线的相关概念
列车在曲线上做圆周运动，必须受到向心力才行，这个向心力由钢轨针对车轮提供。曲线路段的轨道，外侧钢轨高于内侧钢轨，形成“超高”，列车走行其上，向曲线内侧倾斜。列车受到轨道的力，总的来看是垂直两根钢轨形成的平面，方向为斜向上，对这个力做正交分解，可以得到：
，与列车的重力平衡；
，提供了列车的向心加速度（可能只是一部分）；
由轨道支持力与铅垂方向的夹角，就能算出轨道给予列车的向心加速度，而这个夹角可由“超高值”算出。
根据物理公式，向心加速度=速度的平方÷曲线半径
曲线的超高，按照两侧车轮滚动圆之间的距离1500mm（稍大于轨距）来计算。按照国际标准的米
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection faci