列车阻力是指列车在运行中，受摩擦、冲击、振动以及线路的平面和断面等外界条件的影响所产生的与列车运行方向相反的作用力。列车阻力按产生的原因，分为基本阻力、附加阻力和启动阻力。三种阻力的数量均与机车、车辆的总重成正比。
低气压和低气温均构成对机车轮周功率(内燃牵引时)和列车阻力的影响。
Low atmospheric pressure and temperature of surrounding air are both effected to locomotive output power at wheel rim and train resistance with diesel traction.
所以胶囊列车在管道内部行进时不会遇到太大阻力，这样就可以用很少的能量行驶非常快。
So now the capsule travelling inside the tube doesn't encounter as much resistance, and therefore can travel really fast with very little energy.
计算得到的不同流线型列车的整体长细比大小排序与其气动阻力系数排序完全一致。
The order of total slenderness ratios of the five trains is as same as that of aerodynamic drag coefficients.
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