衡量公共交通服务质量的指标。行程长度除以公共交通车辆在线路首末站之间的行程时间(包括各站间的行使时间与各站停车时间)所得的平均速度，单位为KM/H。
在希望运费率较低而运送速度又不是首要因素的情况下，运输能力强、成本较低的水路运输将成为一种可供选择的运输方式。
The capacity of water to transport large tonnage at low variable cost places this mode of transport in demand when low freight rates are desired and speed of transits a secondary consideration.
蒸汽船不仅速度更快，往上游运送货物的成本也只有以前手推运货船的十分之一。
Steamboats were not only faster but also transported upriver freight for about one-tenth of what it had previously cost on hand-propelled keelboats.
在那个时代，铁马才真正地提高了速度。在美国，主要使用铁路运送邮件有将近一百年了。
It was during the ages of the iron horse that delivery really starts to become fast. The United States translated most folk mails by train by nearly 100 years.
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